None of the cross border tunnels were used for 'terror' attacks, liar. Don't play that game of stoking anti-Muslim sentiment as a means to get support, people can oppose Muslims and Jews simultaneously. This section is dead, because people keep seeing you resort to this propaganda. The one where you're trying to condition Americans into supporting your wars in the Middle East rather than have us disengage from the region. Lots of those 'Arab Muslims' are allies of yours, and historically you were aligned with them against the Christians.
In regards to the 'attack' tunnels into Israel by Hamas, here in the 2014 conflict, you can see all sources point to them targeting Israeli forces only:
Hamas Releases Video of Dramatic Tunnel Infiltration that Kills Five Israeli Soldiers
2 Israeli soldiers killed in militant infiltration
These are the only two that took place or succeeded. These tunnels are not as a big threat as Israel makes them seem. And they are entirely entitled to taking such measures to build a deterrence. They even filmed one of the operations against an Israeli base somewhere near the border.
And yes, Israel doesn't define it's borders. Officially it doesn't, because it seeks to expand Jewish settlements in Palestinian land.