Welcome to the clubI know that people dislike them but I've never bothered to look into why.
Think you'll find the Met don't investigate crimes retrospectively.At the very least Wet Sham should have fined him 2 weeks wages, to be sent to an animal charity and be charged by the Met with animal cruelty.
Crowd fund a private prosecution? Before it reached 10k RSPCA would be seizing the cat with the police and instigating proceedings would be my guess.(you need the police to have the power to seize and a vet to say there is a case for cruelty before the RSPCA can take possession I believe, its been a while so I may be out of date!)It's usually the RSPCA that instigate animal cruelty proceedings, not the police.
I'd hoped they'd be all over this.
Plenty of cat haters out there too, if it were a dog I expect it might have been different.