Why? Because such neutrality allowed the creation of a space where people could express anything to everyone at a cost that was practically free. If the creators had been more politically engaged - that never would have happened. It would have been locked down from the start.
Now - if you go looking for it - you'll find studies that observe what happens when human group sizes increase. More "punisher" type personalities emerge, applying greater social costs on expression in an attempt to enforce hegemony. I would cite - but feeling lazy.
In response to the ever increasing social costs imposed by such punishers - the ones who created the free for all in the first place, turn more desperately to their stated neutrality... largely as a means to avoid punishment.
The punisher types won't accept this - because they want to root out dissenters hiding in their neutrality... so begin punishing those who don't proactively state their right minded political stances in every space. They apply such punishment for example - by statements of "deep disgust"... as though this hyperbolic reaction is not hyperbole at all; as though the mere act of not engaging is the worst of moral failings.
I would be terrified of such people... I would be terrified of you - if it weren't for the aforementioned irony with which I opened. You just do it cause game theoretically you are predicted to do so - because of the system brought into being by exactly the sort of people you hate.
We deserve you.
Kinda like how the AI in the Matrix deserve the mathematical anomaly called Neo. They can't get rid of it. But they created it... This thing that wars against them, under the heroic illusion of its own agency and righteous purpose.