To a degree. I think citizens have their responsibility as well. Back in the 90s I had a regular spot in Cambridge UK verbally attacking the lunatics promoting their fringe nonsense in the city centre.
The issue here again isn’t technology but taking ideas as verbatim and lack of critical reasoning. This ultimately leads to people seeking kinship with idiots and frauds rather than dismantling their ideas carefully and ridiculing them.
The issue is as always: education. Education is certainly promoted by the tech sector.
I’m not defending them here for reference, merely suggesting that the issues are human and transcend the platform.
Sometimes letting people vent is a good idea. They tend not to torch neighborhoods.
If you think there is a mass that will get influenced and radicalized, it is probably only due to legislators and companies trying to police people into a narrow corridor of opinions.