Why is this true of felons, but 80% of illegal immigrants don't commit felonies? I wonder if perhaps the added deterrence of getting kicked out of the country

Why is this true of felons, but 80% of illegal immigrants don't commit felonies? I wonder if perhaps the added deterrence of getting kicked out of the country has an effect at reducing felonies among undocumented immigrants. Also, immigrants in general tend to be, as a group, more determined to better themselves than most which is why they're here in the first place. Plus you have things like parole restrictions that limit where a felon can go, move, visit and work.