Other than the fact their only criminality is living here illegally doesn't mean they engage in other horrific crimes such as those committed by Timothy McVeigh.
You are trying to connect the two together, ie., illegal aliens=criminal who commit horrific crimes. I don't see how that is really comparable.
Entering the country and/or staying here ILLEGALLY is a crime, and should be dealt with as such, not excused for commercial (cheap labor)/political (Hispanic vote) reasons.
If you can't see it, your not looking.
I know you hate to research issues you feel you are correct on. But really, look into what percentage of California's outstanding felony warrants are for Illegals. Look into what percentage of inmates are. It's quite sobering.
http://www.immigrationshumancost.org/text/crimevictims.html