Yes in group / out group is pretty universal. It doesn’t necessarily rule the day for everyone all the time, but it’s inside each of us.

Adding to the things other awesome people have said on this, I’ll add the lyrics from David Bowie’s song God Knows I’m Good.

It’s about a poor woman who shoplifts some meat, thinking “god knows I’m good - god may look the other way today.”

And later when she’s caught and led away by the authorities, she thinks “god knows I’m good - surely god won’t look the other way!”

Epic takedown of in-group mentality and religious hypocrisy at once.