Martha, I question what you have highlighted above. The Arvada incident happened around midnight and the shooting in Co. Springs happened the next day. I don't think they hired her on the spur of the moment. She's a regular churchgoer there. She goes to one service, then works as security after the service. I believe they have had security in the past.
The Episcopal church I attended in Miami was pretty much in the downtown area, with limited parking and sometimes some shady people hung around. We hired an off duty cop on Sundays during services to keep an eye on the vehicles and he assisted the elderly often. BTW, he was a real "hunk" and a member of the Miami PD SWAT team. Really nice guy, too.
As vast as that parking lot is, imagine it covered with cars while people are attending services. I have driven by there many times, believe me it's huge. Having security would make sense. Imagine all those cars and a few thugs cruising the lot looking for something of value to steal. Unfortunately, in any city, it's necessary to have security, be it a church or shopping mall. I'm sure they weren't looking to protect their parishoners from a shooter, but crime in general.
Oh, to help in your possible confusion, I don't remember, but I believe it was NBC news after our local Denver news headed right off with two church shootings in the Denver suburbs. Colorado Springs is it's own city 60 miles or so south of Denver.