Why the terror attack near Eilat happened

In the liveblog, I mentioned that the border with Egypt is open and that the security fence that is supposed to be built along that border has not been built. Here's a story about the lack of progress on building that fence. It's less than 10% complete.
Less than 10% of the security fence between Israel and Egypt has been built despite the fact that the budget was approved over 18 months ago.