Yes they did know . They knew the tip was factual when the perp arrived . No resources ? Might be a reason to defend yourself when the police use you as bait without your permission or knowledge I would think .
Would you want the police in Arizona to use you in the fashion that the AR clerk was used I asked ?
I guess marajade wouldn't mind if the cops simply mopped up the mess after. According to marajade, that's what their job is. And of course, their lives are much more important than that of any mere civilian. We wouldn't want to put any police officer in harms way if we can put a civilian there instead...