They should not be throwing rocks at armed peoples.... that leads to death and serious wounds. Tanks could useful for stopping vehicles breaking through the border....
Who said anything about running over anyone?
I get what you are saying though. You are a Rachel Corrie fan I gather.
I've read her story, and only a fool would sit in front of a moving D-9 Cat.
The simple fact is Americans are being killed by illegals in numbers that are truly staggering. AZ is quickly becoming the kidnapping capital of the USA, and it wouldn't surprise me if it ends up as bad as Columbia there. We have NO choice but to lock down the border by ANY means necessary, and if that is tanks, land mines, or 50 cals, that it takes, so be it! 
Kano
From what i read the boarder agents from our side where crossing the boarder to investigate, as they tryed to cross the mexicans drew guns, and in return our guys did also. So as usual, not the whole truth posted. Also though, there is a previous report of a mexican official crossing the boarder and picking something up (maybe a shell cassing?) but that was right after the incident.
Blind rampet support of our actions in this case the same thing that got us in Afganistan and Iraq. Yeah yeah lets put some tanks on the boarder blah blah, lets flex and act like some real bad asses.. Maybe next time we can follow isreal's suit and run over a few kids with tanks. Great idea ya got there..