And you know this to be true for most of them? Maybe you'd better ask those American citizens who have had a family member killed by an illegal behind the wheel, or those whose children have been offered drugs by one of them, or those who had to wait hours in a hospital emergency room because it was flooded with them. And, no our government does not have "better things to do" than track down people who illegally cross our borders. The Open Door Policy is long over.
I think catching terrorists and, you know, actual criminals are more important, for starters. I have also wondered how many illegal aliens have killed American citizens. According to MADD.org: "in 2004, 16,694 people were killed in alcohol-related crashes . . ."
http://www.madd.org/stats/1112
So, even if all 16,694 were U.S. citizens killed by drunk illegal aliens, yes, I think it is safe to assume MOST (more than 1/2) of all illegal aliens are not killing U.S. citizens. Same goes with drug dealers (in fact, I would venture to guess MOST drug dealers are U.S. citizens - my sister is LAPD in South Central so I will ask her if she knows) and hospital ERs.