Why would they not pay tax? They're living here, working here, buying things here. Those are where we collect taxes.
When your rational for "your parents came here illegally, so now you have to live in a country you've never known and don't speak the language" is "someone might not be paying taxes"... You're being cruel to no purpose.
What constitutes "cruel and unusual punishment" is also defined by the laws of countries. That doesn't mean that we don't determine that some punishment is a human rights violation. Likewise, deciding to punish someone for the behavior of their parents is violation of human rights.
Sure, I could, but I don't want to waste my time. I don't get catharsis out of that.
Doesn't mean I don't talk to people, and even if I didn't talk to people on the phone... So what?