Some of Hockheim's technical points about conducting security "professionally" are good. Stuff to study when making a security plan.
He completely misses the point that volunteer security teams are in place because the "professionals" are a big drain on the budget of smaller churches. That's why they are "volunteers." It is also expensive in time and money, both of which come out of the pocket of the volunteers. The choice for the church is not between a bunch of amateurs or a professionally trained, years-of-experience, federally-salaried and -pensioned security team with an essentially unlimited budget capable of protecting the president. It is a choice between "nobody" and having a team of those willing to step up, a choice that became legal only a few months ago.
Hockheim's criticizing Jack Wilson and the team in general for stepping up fulfilling their volunteer duties as best they could given the constraints they have is absolutely loathsome and shows Hockheim himself to be an.... let's just say, for the sake of this forum's rules, "unprofessional." I don't think anyone (and I'll bet least of all the vol security team) is disregarding the errors and the missed opportunities by the volunteer security team, but that does not detract from their heroism. Absent that volunteer security team, no doubt the death toll was going to be higher.
I eagerly await his offer to provide volunteer church security teams free training. Oh, but he wants to be paid for his time. Ah.
(And given the antics of the Secret Service over the years, I would hardly hold them up as an example of how to do things).