I can't speak for "they", I can only speak for me. First of all, I believe the "Wall" at the border is bullshit. Even Savage said "Turn off the magnet and the particles wont be attracted".
Yep you don't need a wall but you have to stop the flow coming in immediately. Bring in the national guard to back up border patrol.  By the way you are considered a bigot for having these views. You are taking food out of babies mouths for Christ sake. If we (America) would enforce the law of not hiring illegals it would stop the problem cold. Oh but I could hear the cries from the Sanctuary cities like Austin.  And of course housing costs would go up.

There was a huge grassroots effort on the liberal side as well, you just didn't hear it because you listen to you're talk radio heroes.
And that would be on what liberal websites? MoveOn.Org? From the right you have Grassfire.org
and of course Foxnews and all right wing talk radio.

I didn't hear a bit of Hannity ( would have turned it off ) but I did hear some Savage and I probably agreed with more then rest though I wouldn't make a habit of it. 
Savage I can take in small does. Probably the most rude and crude of them all but in print (books) he is a hell of lot more articulate.

I think it's an avenue for conservatives to "get" their views. I actually heard one of these boneheads talking about how "talk radio" is a major target for terrorists. Geeeez, talk about a sense of over self importance.
That is absurd. I would agree with you on that one.