Perhaps that's because traumatic experiences don't tend to mix well with rational arguments. If you have a traumatic experience, such as a dog mauling you, you don't think rationally about it. Many times, after a dog attack, a person will have an irrational fear of all dogs, or at least dogs of the breed that attacked them. You may argue to them that such an attack is rare and most dogs aren't like that, but they aren't going to listen to reason, they're going to remember that attack and avoid any contact that causes the fear of another such attack to happen again.
That's fine. That is a perfectly good RPd reaction. If you choose to have your character react that way, then that is your choice to do so. But you should also accept that there are other possible reactions.
Poll