But somehow, it is not. I wonder how accurate the assumption of good will is for the organizers?
That said, these policies are not even about you. They're there so that people who might be victims of harassment can feel safe in the knowledge that there are procedures in place for addressing it in the rare event that it occurs, and that conference organizers will take it seriously. That benefits everybody too. Don't assume you will never be harassed. I'm a straight white male and I have been made to feel unsafe and uncomfortable before by another person, at PyCon even. I'm not an emotionally fragile glass doll that you and others in this thread seem to be strawmanning. It really doesn't take much to be made to feel unsafe by another person's behavior. If you've never experienced that yourself it's because you simply aren't as likely to as other people.
In my case it was minor enough, and I felt in enough control that it wasn't worth reporting. But I'm glad to know I could have done something about it had things escalated.
Organizers tend to be the people who contribute the most to the community of anybody. They work long hours of (uncompensated) volunteer work and endure a lot of headaches. Yes, you may get a petty tyrant or two, but in general they are good people.
Finally, it's not like any of this is going to come into play for the vast majority of people. It's pretty much an agreement to treat others with respect, refrain from harassment and personal insult, and so forth.
Unless a conference attendee does something unkind to trigger these "rules" they are going to pass unnoticed.