Bearadactyl

Well, you're supposed to go there early on because a noob quest takes you there. It's part of Moira Brown's quest line.

Buddy bud, I blew up Megaton. I only went there to scavenge parts to make a second shishkabab.

I didn't, and my character is rarely not evil. Namely because Tenpenny Tower is bugged as fuck and causes frequent crashes. Also, Moira Lives and you can still do her questline. I've only blown up Megaton once in my life, solely with the intent to learn what would become of that Psychotic bitch.