The local people must have an idea who is doing this and I'm all for a bit of instant street justice where cruelty to animals is concerned.
Many years ago a number of cats died a painful and excruciating death in a street that adjoins the road where I live. They had been poisoned. The road is very small - about 60 houses. Sadly, each cat had been allowed out at night.
The final straw, as the police were allegedly not interested, was when a man returned from work to find his wife and children distraught with grief as their cat returned home and died in agony before their eyes before any veterinary care could be given. From memory it was the second of their cats over a short period of time. Everybody in that road had the same idea as to the culprit, who was a self confessed cat hater and who didn't care about painful death or indeed the possibility of very young children picking up the poison themselves.
The man was said to have marched round the suspected person's house and threatened him in no uncertain terms with violence. The man, of course denied any involvement (NB Most of these people are complete cowards). The angry father told the guy that if another cat died in that road, he would be round to rearrange his features. More complaints of innocence and limp threats of reporting him to the police, etc.
Guess what, no other cats were poisoned and the bas**** later moved home.
I read somewhere that these cats have also disappeared in a small road. Hmm!