I'm not saying "don't try", I'm just saying "I think what you are attempting is foolish and that you are just going to kill a bunch of people", that's all. I can express an opinion about a potentially deadly venture, can't I?
I wasn't suggesting that you cannot have an opinion. It's a perfectly valid opinion. I was implying that as a society we have a tendency to impose our opinions on others through laws and social pressure.
A lot of large engineering projects have killed a bunch of people before succeeding. It's fine, as long as the people accept the risk, and aren't deceived.