Yeah? That's because they've skipped their court dates for the last 3-4 times they've been caught & released.
Conviction in abstention should make a comeback! Catch them, jail them and let them appeal from behind bars. No dragging it out for years then! Criminals will beg for fast trials.

Also: the fact that they're in the country illegally is a crime they're guilty of. No "criminal record" is required.