Wouldn't it save A LOT of lives to punish people for their opinions?
Yes, execute you now.
Having an opinion is not necessarily bad. It's acting on your thoughts or opinions if it hurts others that can be bad. But if everyone must have the same opinion, that in itself is bad. Did you ever read the book 1984 by Orwell?
Or we could just throw everything out on the table and let the best ideas win.
We live in a democracy where everyone has rights. Even to their opinion.
Only if their opinion was "Wouldn't it save A LOT of lives to punish people for their opinions".