Israel built the barrier only to protect itself from terrorist attacks

The wall exists in Israeli land and its sole purpose is protecting Israel from terrorist attacks

Response 1
Norman Finkelstein:

" My parents -- we lived in Brooklyn, NY, we owned a house -- my parents were difficult people, they didn't get along with anyone. Actually, they didn't even get along with each other. So, on the one side were the Golds and on the other side were the Kasslers and they did not get along with the Golds and they did not get along with the Kasslers, so they built a fence. And it was within their right to build a fence. But, as everybody knows, when you build at fence, at any rate in New York, you first have to hire a surveyor. That's a fact, I'm not joking. You have to hire a surveyor and you have to make sure that fence is right down the line on your property because if that fence is literally one quarter of an inch on the Golds' side or on the Kasslers' side, they have the right to tear it down. Under law, that's it. Now, let's take  Israel's wall. What happens if my parents decide to build a fence that's not only on the Kasslers' side but goes right around their swimming pool? Well, some people will begin to wonder "are Mary and Harry Finkelstein trying to protect their property? Or are they trying to steal the Kasslers' swimming pool?"

2009 report:

The barrier annexes 9.5% of the total area of the West Bank to the Israeli side of the barrier

http://www.ochaopt.org/documents/ocha_opt_b arrier_report_july _2009_english_low_ res.pdf

Response 2
..The Israel-West Bank separation wall is designed to annex the West Bank. According to the United Nations Office for the Coordination of Humanitarian Affairs, the separation wall currently illegally annexes 9.5% of the West Bank, and by the time its construction is completed it will illegally annex 15% of the West Bank. In a 2004 advisory opinion by the International Court of Justice, the court ruled that the construction of the wall was in violation of international law. The court further states that it “finds that this construction and its associated régime, coupled with the establishment of settlements, are tending to alter the demographic composition of the Occupied Palestinian Territory and thereby contravene the Fourth Geneva Convention and the relevant Security Council resolutions”

There is also an international consensus on the illegality of the wall. The United Nations General Assembly accepted Resolution ES-10/15, which condemns the barrier. The list of countries that voted for the resolution is as follows: Afghanistan, Algeria, Antigua and Barbuda, Argentina, Armenia, Azerbaijan, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belize, Benin, Bhutan, Bolivia, Botswana, Brazil, Brunei Darussalam, Burkina Faso, Cambodia, Cape Verde, Chad, Chile, China, Comoros, Congo, Costa Rica, Côte d’Ivoire, Cuba, Cyprus, Democratic People’s Republic of Korea, Djibouti, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Ethiopia, Fiji, Gabon, Gambia, Ghana, Grenada, Guinea, Guinea-Bissau, Guyana, Haiti, India, Indonesia, Iran, Iraq, Jamaica, Jordan, Kazakhstan, Kenya, Kuwait, Kyrgyzstan, Lao People’s Democratic Republic, Lebanon, Lesotho, Liberia, Libya, Malaysia, Maldives, Mali, Malta, Mauritania, Mauritius, Mexico, Morocco, Mozambique, Myanmar, Namibia, Nepal, Nicaragua, Nigeria, Oman, Pakistan, Paraguay, Philippines, Qatar, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Saudi Arabia, Senegal, Sierra Leone, Singapore, Solomon Islands, Somalia, South Africa, Sri Lanka, Sudan, Suriname, Swaziland, Syria, Tajikistan, Thailand, Togo, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Uganda, United Arab Emirates, United Republic of Tanzania, Uruguay, Uzbekistan, Vanuatu, Venezuela, Viet Nam, Yemen, Zambia, Zimbabwe.

Meanwhile, the countries that voted against the resolution are Israel, the US, Australia, the Federated States of Micronesia, the Marshall Islands and Palau.

Furthermore, human rights organizations, including Israeli human rights organizations such as B’Tselem, have condemned the construction of the wall. In a press release by Amnesty International titled “Israel/Occupied Territories: The fence/wall violates international law”, the human rights organization states:

Since the summer of 2002 the Israeli army has been destroying large areas of Palestinian agricultural land, as well as other properties, to make way for a fence/wall which it is building in the West Bank.

In addition to the large areas of particularly fertile Palestinian farmland that have been destroyed, other larger areas have been cut off from the rest of the West Bank by the fence/wall.

The fence/wall is not being built between Israel and the Occupied Territories but mostly (close to 90%) insaide the West Bank, turning Palestinian towns and villages into isolated enclaves, cutting off communities and families from each other, separating farmers from their land and Palestinians from their places of work, education and health care facilities and other essential services. This in order to facilitate passage between Israel and more than 50 illegal Israeli settlements located in the West Bank.