I'm honestly at a loss as to why some people (and organizations) are hell-bent on hampering attempts to decarbonize, and amplifying whatever tiny negatives they can whether they're real or not, as though nothing less than 100% perfect is worth replacing the awful status quo.
Firstly, as stated by others, accepting these things requires us to accept that our lifestyles are not sustainable, even if we can afford them financially, so we make excuses.
Secondly, I think there probably is an amount of ego involved where the armchair experts honestly think that they have thought of something that "the politicians" or the "experts" have missed. You see people on forums/TV saying with no irony or doubt that "Electric cars are not environmentally friendly because of Lithium batteries", or whatever, without actually having any figures to back this up.
I agree that doing something, even if not perfect, is better than nothing but I did a Penn and Teller show where their logic was "do nothing now because it is expensive. Wait until we have better/cheaper technology and do it later". Again, seems illogical but people do believe that.