I think a world where those people were no-platformed more often might be a better world, but of course I can't know.
And getting no-platformed isn't losing rights, you can always make your own platform, it gets easier and cheaper every day.
And do you honestly think you should have the right to determine what elections should be considered "harmful" enough to shut down others speech? There is a wide range of opinion short of the alt-right but in the same direction that could be shut down too, for instance apparently a majority of white people think there is racism against now (https://www.npr.org/2017/10/24/559604836/majority-of-white-a...). Do you think this opinion is so wrong that it should be silenced from the public forum? Do you think it would even be possible to do so?
I would only insist on making a distinction between "a public form" and "the public forum"
As an owner of a machine, I see no reason I should be forced to host some conversation I consider harmful.
OTOH I would encourage ISPs to maintain a common carrier status just out of pragmatism. Once you memory-hole connections to some IP address, I think you become responsible for the content you serve. All or Nothing.