Have you ever seen a political rally? Calling people low-lifes and idiots is pretty much standard, she just did it a bit more directly than most.

And who wouldn't cheer if one politician killed another? Fewer speeches to listen to, and it proves that she's willing to take action.

Besides, as far as I remember, the next clear view we have of the people shows a huge riot going on. So they cleary weren't totally enthralled.