AIBU to punish child for killing insects?

[Unsername1233]

This evening my DS and his uncle (strange age gap, uncle is 8 and DS is 5) were playing out in the garden. We have been watching this one particular spider who has welcomed the outside of our living room window as his new home. We have loved watching the different webs made etc. I thought they were playing nicely in the garden, however it transpired that they were finding insects to kill, including the spider in the window!

I am equally horrified as disappointed that my son has done this!

Anyway, I taken a star of his chart (which led to him not having his treat today - a small temporary minion tattoo thing!) and explained why this was wrong (although he already knows this!).

My DH thinks I’m being unreasonable as it’s “just something that all kids to”. I obviously don’t agree with this SO was I being unreasonable removing the star from the chart, therefore ending in no treat? I don’t want to raise a child who thinks this behaviour is ok!

I’ve never killed a spider before, too scared, but everyone I’ve known in my life would kill it for me or kill it if they saw one in their house. I don’t think they would faff around catching it and putting it outside.
When i was on holiday in a hot country when I was 9-10 years old I enjoyed stamping on these ants. No one told me off at the time- I thought they were just pests. I wouldn’t do that now.
Also when I was under 10 years old I kind of enjoyed annoying the neighbour’s cat by spraying it with water from a water gun. Is that considered really bad? I knew it was wrong at the time though because I didn’t want my neighbour to see me.
My family weren’t an animal loving family though. My mum doesn’t like animals so maybe that’s why I didn’t really care about them. I do like them now.