Really glad to hear that, and I resonate with this too personally. In a way, I'd say Tantacrul achieved the overarching goal of "saving lives"/making lives "better", just not in the way he (along with many others) knew how. Honestly, like MiMif said, I don't really blame them, as those are usually people who are "missing" ideological & sentimental components to "be able to" think/feel the way we do (for better or worse). Those who can't intuitively resonate with how we really feel often by design are antagonistic to any expressions regarding suicide, because these ideas arouse the base survival instinct they have (which I presume tend to be quite a bit more "intact" than ours), thus they tend to be the most ill-fitted to understand, let alone help us.
I just came from a reddit condemning this website, and I realized one of most common talking points against it is "how many lives has it been responsible for taking", but not "how many lives it's responsible for saving". Once again, I don't blame them, as it is human nature to gravitate towards more concretely measurable metrics. You can definitively count the number of people who have found ways to CTB from this website and applied it, but not as concretely conclude those who have definitively been saved unless if you had a theoretical time/space machine to travel to a parallel universe/timeline in which someone did in fact commit suicide because they didn't discover this site. Something else they don't account for is that even in the case someone successfully CTBs, they can find hopefully the least painful method that is at times also the least burdensome to others. Someone who doesn't have a proper outlet may be prone to more impulsively CTB that have effects that are less in their control, and overall result in more net harm. In general, this sort of situational irony is unintuitive to most people, and coupled with their presumed more "functional" survival instincts, it makes sense that this kind of website would raise their ire. It's unfortunate, but also speaks to how important it is to keep this community around, and why simultaneously it can be hard to without constant backlash.
To draw another connection to something else I saw that might explain why this happens, there's a video talking about "self-regulation through fantasy" as the reason why many of us put off work/don't end up doing things we plan to. In a way, in an odd twist of events at least for some people (at least for me), suicidal ideation/discussions seem capable of having this effect. I could go further, but I am going to stop myself before it turns into an essay nobody here asked for hahaha...I mean it already kind of is, sorry...but hey if this provided any kind of value for anybody, feel free to let me know :)