Then, politely, fuck off.
Children are a part of the society that you live in, whether you liked it or not. I don't know who hurt you, but you were also a child once. You pooped your diapers, you cried, you misbehaved. How your parents have treated you when you did these things has a very direct effect on how you behave and think right now. My guess is they were shitty, it would explain your irrational anger and hatred towards kids.
Misbehaving in public is a necessary step to learning how to behave in the first place. It's a learning by doing thing. You won't get your child prepared to act kind, nice, and considerate with other people if you don't let them meet other people. You cannot teach your kid how to behave on the outside at home. How is that not obvious to you? It is inconvenient, it is annoying, it is hard, and it has to be done so that we don't have underdeveloped, immature, dysregulated asshole adults a generation's time from now.
Parents are always obligated to watch for their kids and show them how to behave. This doesn't mean they can, or should, control their every move, word, reaction, emotion, or behavior. If a 3 year old cries and it is uncomfortable for you, that's your problem. It is not the child's or the parent's duty to shut them up with a gag ball ffs. It is their duty to help them resolve and guide them through their overwhelming emotions. So that they will grow up to be emotionally healthy adults.
Children have an innate need to play. They learn via playing. They learn via trying things out and touching them. They learn to walk and run by walking and running - and falling and failing. They also learn about the world from the world's reaction. Being met with disdain for solely existing and breathing won't help them to grow up to be adults with a lot of self worth.
You don't get to decide who is part of the society and village you live in. You don't get to cherry pick your neighbors.
You don't want kids in your village go live in a cave.
Yes, I have a lot of anger for people who meet the most vulnerable parts of our society with hostility. I have an immense anger for people who don't think these vulnerable people in the making have a place in society.
Congratulations on not being allowed to scream in public, ever. Did you good. Your parents had shitty standards and now you want to enforce these on other children so that they will also grow up and hate children. Great idea.