Indeed, and this begs the question of how the hell something like that is even possible! I asked myself that question a lot, and Stove gives some clues about the intellectual milieu Darwin was part of (just finished his "On Enlightenment", which gives a few more clues, though much is already covered in Darwinian Fairytales). The Darwin clan and friends, Bentham, James Mill etc. These guys were freaking NUTS!
Perhaps what happened back then was similar to what's going on with today's Gender Studies and SJWs. It was basically a small, elitist clique of academics, thinkers, and a few well-situated admirers and "promoters" that were in love with radical enlightenment doctrines. As I understand it, most peole then thought they were some fringe nutjobs. Almost all academics were Christians, after all, and the society was still based on religion to a large extent. The values of "normal people" were still in place in everyday life. So nobody took them seriously and they had time to build up their case, to slowly push the limit of what's acceptable one inch at a time.
For example, at the beginning some argued that the "working people" should marry late so that they don't have so many children. Later, some promoted contraception, even printing leaflets and the like, to reduce the working people based on Darwinian principles. And on and on it went.
I gues it went similar in science - just as with the gender theorists, at first, everybody laughed at these Darwinian lunatics. Then they became more entrenched in academia, although still a minority considered eccentric. Then, slowly, Darwinian ideas became more and more accepted and finally holy doctrine.
That's my theory so far anyway. The scientific method doesn't stand a chance against ponerization. Political Ponerology perfectly describes this process : some clique of pathological nutjobs comes up with some silly, black-and-white "theory" that seems completely novel, radical and cool. This attracts other wannabe-nutjobs who fall in love with this theory, which they see as a tool to radically change society - be it killing the "unfit" or turning people into genderless zombies. These people find that cool and revel in their power to do away with the entirety of human tradition, with common sense and the burden that is reality. Everyone underestimates their incredible drive and zeal and considers them crazy, but they steadily build their networks and gain more and more power - until they can use force and intimidation to crush dissent. Then it's too late.
This whole Darwinism thing is such an incredibly sophisticated mindjob, kind of a skilled 4D Judo move handling 5 different things simultanously, that it boggles the mind. It seems to take into account different personalities and different steps in different periods - including a strange secular backlash from the postmodernists that is going on at least since the sixties, which I think has to do with open personality types revolting against cold and spirit-less materialist science, while still being trapped in evolutionary/atheist doctrine themselves... Who would come up with that? Then you have SJWs, the materialist establishment, the Enlightenment glorifiers, the evo-psych shtick, the white suppremacists, the free-market radicals, the neo-Marxist "happiness utopians", and on and on, everything strangely entangled with Darwinism. It's amazing.
And yes, lately I thought humanity is doomed as well. How can anybody crawl out of this mess without first freaking out and killing his neighbor? Or following the next patholgical puppet master, ideology or belief system that replaces genuine love and conscience? Perhaps the only hope lies in people's hearts. It's amazing how resilient good-hearted people can be. And "knowledge protects" never rang more true than today!