Linus is not in the wrong here. You have an anti-vax spouting BS on the Linux Kernel dev list of all places. It's absolutely not the right venue for that. He could have just expelled the idiot from the list. He chose not to do that.

Some people will listen to (perceived) authority. Linus has a large following. It's fair to say that a non-zero number of individuals may be persuaded by his strong stance. I doubt the person that he was replying to will listen to anything, but if anyone else does, it's a win.

If someone is claiming that a person is "shedding" mRNA, the point of education is gone. It's ok if someone says they are unsure about this 'new' technology - you can then sit down with them calmly and explain how all of this works.

However, if they are just parroting anti-vax talking points, they should be shutdown and quick. They have long stopped listening to reason, and are on the "vaccines cause magnetism" territory. They are actively trying to spread even more misinformation. This should be contained just like we contain viruses.

It's not really up for debate. Don't like a particular vaccine? Try to get another one if you can. Don't try to prevent others from getting it based on superstition.