limited to, out

[redgiant]

I read this sentence in American Idol recap:

I mean, Simon even did an air rimshot after one of Carrey’s on-air jokes, a move I thought was limited to American parents out to embarrass their kids.
On the Scene: 'Idol' Top 12 results show | PopWatch Blog | EW.com

Does "limited to" here mean to make sth exist or happen only in a particular place or within a particular group?
That means it is just American parents use such a way to embarrass their kids?
Also, why "out" is used here?

[Anglika]

#1 In this context - to a limited group [American parents...]

#2 "out to do something" - aiming to do something/intending to do something.