I don't know of any public schools in 2021 where evolution isn't taught. If there are any, they're few and far between. We don't have to worry about an epidemic breaking out of creationism suddenly being taught in the public schools.
If creationism is taught at religious private schools, clearly the parents signed up for that and wanted it.
However, critical race theory is indeed being taught in schools, and is both trendy and on the rise. This idea is no longer fringe. Many Democrats support teaching such theories in the classroom, believing that any teachings which supposedly "combat hate" and "fight racism" are appropraite for schools, even if they're teaching controversial political opinion as fact.
It's incredibly foolish to believe that, if left unchecked, this won't spread into a lot of public school systems in the US. Most of these schools are run by Democrats, so what's to stop it from happening?
DeSantis did the right thing. Rather than allowing some left-wing local administrators add this to curriculums in bluer areas of his state, he just outlawed the entire thing before it can even get started.