Open Source software is used to commit all sorts of evil. Open Source developers contribute their work freely to be used in this way. It’s time for Open Source developers to ask for something in return for that work.
But what to ask for? We have chosen vaccination, because the need for it is scientifically verified, because so many people are killed or maimed because their parents deny them vaccination, and because the ignorance that causes rejection of vaccination is an easily-identifiable evil. There are no legal ambiguities where rejection of vaccination is concerned, so it is simple to require it in a license.
The rejection of vaccination is not a distant evil. It is happening right around you. It effects people you care about, but you’re unable to intervene. Or you were, until now.