But you only have his opinion to go on. You have one side of the coin - your father's side. How can you really make that decision without knowing both?
Exactly my point. If you went out to talk to the Muggles back home, you'd find them just the same as here. Just... Less accepting of magic, likely. You should see if you can find a copy of The Philosophy of the Mundane: Why the Muggles Prefer Not to Know by Professor Mordicus Egg while you're here. I'm sure it's around somewhere and I think it would better explain my position than I can.