Honestly I don't see the problem with what the 911 person said. Would you rather he/she tell everyone who calls in to "get a high powered rifle, station yourself at a window and shoot anything that looks suspicious"? I don't think so.
This is much ado about nothing at all, IMHO. Or do you just not like strangers telling you what to do? Seems a little juvenile. You can elect to follow the dispatcher's advice, or you can ignore it. There's no need to get all upset about it.