In a debate, both sides of the argument are up for questioning. You can enter a debate certain that you are right, but if you're not prepared to entertain the i

In a debate, both sides of the argument are up for questioning. You can enter a debate certain that you are right, but if you're not prepared to entertain the idea that the other side might be right, then it's not a debate, it is hectoring. If your aim is to convince others of your views, expect to be disappointed -- ask yourself, how would you respond to hectoring by someone who is absolutely certain that you don't know what you're talking about, you just need to have the facts explained to you? With hostility I'll wager. I speak here as someone who is pro-vaccine, and who's had the vaccine. I have (much younger) friends who choose not to take the vaccine, I don't try to convince them to, "that's your lookout antivax boy, no skin off my (well vaccinated) nose <laughs>". I take the piss out of them, we remain friends, but in the end it is their choice, and people respect the choices of their friends.