This is completely incorrect, nations that have halted agricultural mass application of antibiotics have seen a huge decrease in antibiotic resistant bacterial present in the animals.

https://www.extension.purdue.edu/extmedia/ID/ID-420-W.pdf

This is because antibiotic resistance has a high biological cost to the bacteria, and they get out competed by bacteria without that adaptation when antibiotics cease being present.

Some bugs already exist. We don't want to breed any more.

Moot. We have to rebuild our antibiotic-creation capability. The number of bugs is 2nd-order importance.

Our antibiotic-creation ability is moot if we don't fix our anitbiotic-resistant-bacteria-creation problem. Both need to be tackled.

The bugs are very easy to kill - when not in a person.

The bacteria are also less competitive, so all you have to do is stop using the antibiotics and you will make it less likely for them to survive in the hyper competitive farm waste.

As long as you stop making them the resistance will die off as "not worth it".