A deported criminal who serves no prison or jail time can come right back within less than 72 hours

The real options for visitors with behavioral problems are

1 Convert - Teach them to behave differently but they might not

2 Imprisonment

3 Enslavement

4 Legal Execution - I do not support this option, we can not trust our government with the death penalty, this can not be reversed if a innocent person is wrongfully executed

Are there any other options than these four that actually work?