It’s not just important for those that cannot be vaccinated for health reasons. It’s important for the x% that the vaccine was not effective for.
If it’s 90% effective, then you still have a 10% chance of getting it if exposed (Though probably less severe, you can still spread it). But if it’s 90% effective, you have a much lower chance of being exposed but ONLY IF MOST PEOPLE GET THE VACCINE!
Sorry, not yelling at you. Just making the point that even if you get the vaccine, you are better off if everyone else does too.