I'm with the posters who suggest calming down about it. And the ones who suggest you take the "you" out of it. I do mean that in a nice, yoga-ish way.
I can see you're already come round to that view, so I'm not going to try and persuade you - just flesh it out a bit more!
I really wouldn't take it as an implied criticism of my parenting skills. I have a theory that many people become quite shocked at the atomism, individualism, and un-child-friendliness of society when they have children. They/we then act in small ways to try and reverse this - and to signal their disapproval and rebellion from - these mainstream/majority values whenever they can.
The playground in the park is one of the areas where people with children can do this. Lots of mothers (in particular) will go to the park and try and "act out" the fact that they are not selfish and care-for-others, particularly other-children, in a general, non-specific way.
It's an act of bonding.
And in addition, I suspect, a conversation-opener: lots of mothers become quite lonely in the years their children are small - forced into situations with lots of other women they don't know - in a crowd with no actual established bond of contact. That is quite stressful.
So I must admit, whenever I spotted someone doing this, I'd chat.
And an anecdote to finish:
I was in one park playground once and witnessed a young girl, about nine, dressed only in tracksuit bottoms, surrounded by a group of other children taking it in turns to karate kick her. The girl was fighting them off, one by one, with some violent moves herself. The woman on the bench next to me also saw. It was eerie, and horrible. She said: "It takes a village to raise a child" and we both went over to stop what was going on, then found her mother. Who was, sadly, a little unconcerned, to say the least.
Sometimes, communities can be a very negative experience, closing down the capacity to be different, and innovative - something you run away to the city to escape from. At other times, they can be a lifeline - and the absence of a group - for extended support - can be painful.
I like to think that, generally, we try to be the best we can be, and the parents "helicoptering" in your park are probably signalling care, a willingness to connect, and so on, rather than disapproval. and that's kind of a nice thing.