Again. General. Thread.
This thread has a ton of DMs in it saying they're specifically using it as a stick to enforce behavior. 'No Evil', 'preventing murder hobos', 'making them reflect on their actions'.
Yeah. If I had a player for whom the only thing keeping them from playing like a jerk was Alignment, I just wouldn't play with them. I wouldn't sit there going "Uh-uh-uh! You're Neutral Good!" every time they did something appalling.