Guys, can't you see? TLA and LoK are pushing an anti-parent agenda!
Aang's parents: Never seen
Toph's parents: Over-protective
Katara and Sokka's parents: One died, the other was away in a war
Lin and Suyin's parents: Didn't know their dads, and their mom was crooked cop that let her children get away with everything
Korra's parents: Dad was arrested
Tonraq and Unalaq's parent: Dad banished his own son
Tenzin, Bumi, and Kya's parents: Dad focused on one of his children while neglecting the others
Isn't it obvious? Nick is trying to destroy the family!
[Yes, that was all jocular. I know the actual context, I'm just kidding.]
But seriously, the Avatar universe has a long tradition of bad or absentee parenting. Of course, so does the real world...