I don't believe that rank-and-file deniers will be able to use their ignorance as an excuse for they harm they cause. A drunk driver may sincerely believe he's not doing harm, but we still define drunk drivers as immoral. Those low-level deniers are like drunk drivers with the truth.
Taken past a certain point, deliberate incompetence crosses the line into immorality. Deniers have been presented with all the tools and information they need to not be incompetent, but they still deliberately choose to be incompetent. Hence, they are morally culpable for the harm that derives from their incompetence.
The last I heard, human beings live on earth. This includes me, you,
everyone. If one of us is culpable, all of us are culpable. I don't see too many people running to the hills to live off the land and escape all this so-called immoral behavior we're all engaged in.
All you folks tripping on whatever is supposedly going on with our environment better not think you're above the fray: You're down here wallowing in it just like everyone else.
You wouldn't be reading this if you weren't.
Thanks for coming. Now, let's all go get pizza and beer!