I definitely find it difficult to disagree with the spirit of what you are saying here. Maybe this is the difference between leftist and non-leftist tendencies in this type of thought (not just ecofascism narrowly but all forms of environmental radicalism)
Leftism, needless to say, is inherently based on weakness and unhealthy self-abnegation. This probably has some sort of root in their psychology of resentment and self-hatred. I used to have some screenshots of these people lying around, but if one digs far enough into the anprim community on Twitter they will soon find people who are advocating for complete human extinction and the like, all of them leftists. Their hatred of self hits such proportions that they want to destroy everything like themselves, ostensibily for the planet. I don’t doubt that they are disgusted to some extent by what is happening, but it takes a perverted and unhealthy expression due to their leftist psychology.
The biggest difference here is that in contrast we are not willing to negate ourselves, even if we recognize that we are faced with a severe problem in need of a radical solution. On top of this, there is of course also the factor that we are generally more cognizant of the restraints we exist within (Laws of Nature, etc) and the fact that there are essential natures to things. Leftists (esp. jews) despise all of these things, and want to turn them all upside down, yet still profess concern for Nature, despite what they preach being an actively rebellion against Nature and its laws.