I think it can also be a nice thing to do.
One morning, I had to leave for work in 30 minutes and figured I'd just play a little bit and then cryo when I had to leave.
I rolled Bartender ... Vampire.
I thought, well we're low-pop, security is probably understaffed, I could go straight up murderbone vampire for the next 30 minutes.
Then I thought about the other vampires in the round and thought nah, I'm not going to do it.
If I wanted to play stealth vampire, I'd be kinda pissed that some murderbone vampire blew my cover with mayhem, and especially when they couldn't even finish the round and get the green-text anyway.
So I ahelped to say I had to leave in 30 minutes, please take away my vampire and give it to someone else.
I got de-vamped, and then *BWOINK*: Enjoy your round of not biting people!
I never did get to see how the round turned out as I went to work. The vampires hadn't been called out by the time I left, so I like to think that I made the right call.