So I decided to play a little and test it out, first thing I'd say is that if anyone is playing on PC, it does have some of the common ... "design errors" ... that UE4 games on PC are notorious for - namely, you need to tweak the .ini files to turn off mouse-smoothing and motion blur or it feels ... sludgey? But they're basically default tweaks and take 2 seconds so no major problem there.
Anyway, I decided to test out the Role Playing elements immediately aaand...
You can indeed convince the first person you meet to give you his gun, then immediately leave the conversation and shoot him in the face
I reloaded the save after tho, not actually planning to play "chaotic evil".