Absolutely a step too far. Which is why he was found guilty of assault.

He probably needed to intervene in some capacity however. Imagine if something had happened to unsupervised 6/7 year olds in his pool? It’s nightmare fuel. Come home to find a drowned kid in your pool?

I see his frustration also, it sounds like this wasn’t the first time neighborhood kids had snuck onto his property to use his pool. He really took it too far, though.