You can't go out in public naked and just ask everyone to look away. If you want someone you don't trust to run unvetted general purpose code on your machine you have to accept that you are trading away some privacy. You can sandbox them (wear cloths) but that doesn't give you strict privacy.
It's not a binary situation. Lots of fingerprinting is based on e.g. audio or canvas rendering quirks. Browsers should be obfuscating that shit.
I do wear clothes (all JS code runs in a sandbox).
This is a bit like saying "you should lock the door to your house" and therefore refusing to prosecute someone who steals from a house with a broken window frame. I did lock my door, and it's still a crime regardless!