Why would you want to kill your cats or even neuter them when there are better ways on how to stop cats from spraying. You just need to have some patience and think about it. The cruel practice of neutering your pet cats is simply not right. Why would you even want to consider neutering your male cats when there are practical and proven solutions on how to stop cats from spraying.
First of all, you have to realize that those cats are your pets and you are supposed to love them. Neutering them would hurt them. Whoever suggested you the idea of neutering your cats to stop them from spraying needs to getting himself admitted in a mental asylum. If you thought about the idea yourself, then you should get yourself admitted in a mental asylum. Patience is a virtue which you need to learn if you want to really stop your cats from spraying without any cruelty. You also need to be careful because the cops can arrest you if they find you in the act of being cruel to your cats. They won’t listen to you even if you say that you are doing it to just stop cats from spraying.