“I just visited a country far richer than USA. Every 6th citizen is a millionaire. When they find an illegal, they deport them next day. If you enter again, you land in jail. There are no food stamps, no welfare or free health services to illegals. Guess what, they have no problem with illegals.”
The jails would be filled with illegals and we house them, feed them, provide healthcare for them and pay guards to guard them right after building more prisons. Something like 100K per prisoner per year.
You are missing the most important reason to discourage illegals.
Punish employers who hire illegals. The illegals come here for job opportunities as you said. No jobs, no need to come here.
Their prisons are not like ours. It is tent city in hot weather. Have you heard of sheriff Arpaio from Arizona? No one wants to come back to his jails.