Is US-Mexico Border Fence needed to protect US security?

The American people demand border security but I'm sure construction of 700-mile fence along Mexican border is unable to gain control of this area of illegal immigration. I rally to opinion of Gov. Janet Napolitano, who, smashing the idea of a border wall, told the Associated Press, "Show me a 50-foot wall and I'll show you a 51-foot ladder at the border!"
Thus, the fence plan is absolutely ineffective for strengthening our southern borders. On the contrary the creation of 1100 km fence along a third of the US border with Mexico may lead only to raising the flow of illegal immigrants into the United States. And there is no surprise that according to a poll by Opinion Research Corp, for CNN, 53% of Americans oppose the barrier construction.
Moreover, the bill that Bush has signed on October 4 was not a step towards immigration reform at all. It has become a step backward on human rights; a step forward in making America similar to GDR totalitarian regime, committed a grave mistake in building the Berlin Wall. Formerly we laid to Eastern Germany charge for superfluous xenophobia. What for? Now instead of finding better tools to enforce our immigration laws we are building the second Berlin Wall! So much for our being the torch of liberty and democracy! The US-Mexico Wall completely damages our democratic image in the eye of world community.