The problem with this sort of censorship is that it has huge collateral damage that most people don't see. WPD is the best example because that kind of content wasn't hurting anyone. Go look at where it's moved to, and have a look at the kinds of people commenting there as opposed to the reasonably level headed comments on the reddit version.
Every time you kill a subreddit or facebook group, 99% of the users stop participating in that kind of content, and the other 1% scurry off to some out of sight echo chamber until one day they randomly pop up again to murder a bunch of innocent people because they've been corrupted beyond saving.
Everyone was talking about this for a hot moment after the Christchurch massacre, but nothing was done and now nobody gives a shit again.
It's important to let people with divergent views to feel some sort of social pressure to change. Those 99% of people that have no interest in blowing up buildings or murdering children are the best weapon we have to convince the other 1% of people with weird interests that the world as it is ok without them taking some drastic action. There's always going to be a small subset of people that will rebel, but the important thing is to make sure that otherwise normal people (that want to watch porn, or learn how to safely handle a gun, or learn about cybersecurity, or get desensitised to gore, or whatever else is on this week's "think of the children" hitlist) are integrating into civilised society and not being dragged into cesspits of violence and terrorism because their interests have been deemed by a bunch of fucking software engineers to be "bad".
We're well past the critical point where enough large platforms have banned all the "bad" stuff that any new contenders either need to ban it too or become one of those out of sight echo chambers themselves. The only way to fix it now is for everyone to agree to be less stringent all at once, together.
It's worth remembering that the internet wasn't very censored 20 years ago. Most of us grew up during that time and turned out fine. I'll take tubgirl and lemon party over neo-nazis and conspiracy nutjobs any day of the week.