@Mrs.peacock said:

OK, as much as I like this movie, I have to be honest here, the part were Lisa threatens the parents of one character into letting him come out by pointing a gun straight at them does kind of unsettle me a little. It kind of makes me wonder just what the film's makers are advocating here.

It was a water gun. After the scene you're referring to, Lisa fires the gun at one of the boys, and water hits him in the face. I don't know if that necessarily excuses her behavior though.