people can't go around constantly cleaning their armpits.
In theory we could if you catch my drift. Some people use it as a fetish, but personally I'm not that brave.
Also you can just get deoderants that aren't antiperspirants
Pardon my eventual ignorance, but from my understanding deodorants are perfumed - "stink mitigation" if you will and antiperspirants are just to try and sweat less, like "stink prevention"