Why do we need roaches?

Question

I hate them i think i have an phobia for them if you guys explain why there useful maybe it will help my phobia thank you

Answer 1

they're like ants they eat crumbs and such that we can't clean or see but that would accumulate if they weren't there

Answer 2

We don't need them, they are just one of those gross creatures, (like centipedes), put on this earth to add a variety to the food chain for other creepy crawlies and birds