You know, adventuring and being a hero always sounds better when a bard tells the tale. And it always sounds a lot worse than it really is when a prosecutor tells the tale in a court of law. The audience is usually a lot less drunk too.
We have had adventures going to strangers homes for years in JRPG's to take their stuff. It was only a matter of time before they became murder hobo's.
Besides she was going to kill them, even if they didn't try killing her.