Likely you are understating how often that occurs as much as the person is overstating how much that occurs. You don’t interact with those people and they, trying to argue against, constantly interact with them.

I’ve seen people absolutely take the side of “Israel must be protected, there is no other answer” and plenty of it on Lemmy and it comes from its users.

Don’t diminish other people’s experience when they share it, people are often honest about their perspective even if it might be wrong. Ignoring it does no help for either of you.