That's a Liberal's argument. One has nothing to do with the other. A citizen that commits a crime is something we have to deal with. An Illegal Alien committing crime is something we should not have to deal with. The amount of money and lives lost because of Illegal Immigration makes Mcveigh look like a piker. It happens at a slower pace, but it still happens.
"A citizen that commits a crime is something we have to deal with. An Illegal Alien committing crime is something we should not have to deal with."
That would be the ideal. But such is not the case. Crime is crime and can and should be prevented regardless of citizenship.