Why Are We So Intent On Screwing With Paladin Alignment?
 
Paladins are like Superman. If you play them as heroes, people will decry you for being boring and uncreative. But if you change them up, even the haters say that's not what they're about, and you should go back to being a big blue school boy.

The lawful good alignment is baked into the class, mechanically and thematically. Here's how, and why.