Language does what language wants to, pedants try to fight it, pedants eventually lose. To boldly split an infinitive continues to be correct in spite of it being "wrong".
Specifically this is how American English works. From composition to pronunciation. It's a beautiful mess <3
It's how all languages work. Some languages have bodies that like to pretend they can regulate them, but it doesn't actually work.
But it somewhat does, no? Why else would words change meaning over time?