I'm agree with Jeff White's take on things. I shudder to think of the ribbing.
As for why a K9 Unit was in a park and at a playground, it that a serious question? Folks, K9 Units go to parks for the same reason other people with dogs do, with the added benefit of being extremely popular with the general public, and especially kids... who hang out at playgrounds in parks. I know, I know... popular UNLESS they leave their guns behind.
As for the "solution," perhaps they (and you too Jeff) should consider investing in Safariland's ALS line, engineered precisely to prevent such things.