Both intellectually lame and grammatically incorrect:
"Everyone is entitled to their opinion."
Advice given to children by cloistering parents and by my local government-run primary school:
"Never talk to strangers."
[Advice I gave my own children: "Avoid any situation in which a stranger might capture you, e.g., getting into his car, walking down a dark alleyway." and "Don't believe everything your teachers tell you."]