Fair enough, but in the case where one is heading off a cliff and one refused that there is a cliff, I am attempting to show all the warning signs that the cliff is ahead. Screaming that here is a cliff ahead will get written off as hysteria. It is attempting to not completely challenge one’s views at once, but inject the possibility that some of those views are wrong. This can lead to a domino effect if one wants to actively pursue the issue and think about it. For example, even if one refuses to believe it’s not bad or that it isn’t mad made, if they look around a little one can’t deny changes are happening. Regardless of the cause, it is going to cause a lot of issues. Once one acknowledges this I think they are more likely to agree later that limiting mans’ effects is the smart thing to do.
This reflects my own journey where eventually former skeptics given talks on the issue is what turned me around. YMMV