The number of ‘’good ones’’ that MAY be able to come back in will be only a fraction of the masses that will be going home. As long as that doesn’t set up a chain migration situation (which can be done), it’s a net positive. A big net positive. A few vs. a flood.
That depends on how you define “good” if good is defined as Felons. Then nearly all of them will be coming back.
These are the kinds of answers you will NEVER get out of Trump, because he will just repeat “They have to go!” or will attack the questioner as not being “fair”