I tell everyone about Firefox and uBlock Origin. Blocking YouTube ads is enough of an argument to convince anyone to at least try it out. I've never seen someone who didn't love the ad-free web experience. It's actually safe to just install this software on random computers: people's quality of life will be invisibly yet thoroughly improved, they will notice that things are just better even if they can't explain why. They'll be a lot safer from malware too.
The objective is to reduce the return on investment of advertisers as much as possible. This will only happen in significant enough numbers once a significant portion of the population is blocking ads. It's our moral imperative to spread ad blocking technology far and wide.