One of the greatest risks is to have a precieved threat make everyone think they have to close ranks and stifle all debate. That is how projects (or even societies) die.
Much has been written on this topic, you should avail yourself.
https://conversational-leadership.net/tolerance-is-a-social-...
In my experience, the majority of accusations of various groups or individuals wanting to do these things, are simply not supported by the available evidence. Meanwhile, accusations of the desire to discriminate, impose religion etc. are often cited as justifications for censorship.
I try to be open to the possibility that I'm wrong about things like this, but even as someone who tends to be very hesitant to make judgments about other people's motives, it's hard for me to imagine how much more convincing the evidence would need to be in order to conclude that one of the major political parties in the United States has long abandoned any semblance of good faith. Having a civil discourse requires both sides to sit at the table, and that can't happen when one side is busy flipping the table instead.
Plenty of people disagree with you (and each other) about which groups of people have these characteristics.
> the obvious follow-up question is how exactly you can effectively debate someone who quite literally is opposed to the idea of rational debate
I'm unclear on how "ignoring inconvenient facts" is supposed to imply "opposition to the idea of rational debate". But my experience has been that both are common among the most active and respected Wikipedia editors and curators. Just try to get one to give any concrete standard for what it would take to start or stop considering a source valid for WP:RS purposes, and then try to hold them to that. The combination of RS inertia with WP:NOR is the primary thing enabling citogenesis (https://xkcd.com/978/).
> it's hard for me to imagine how much more convincing the evidence would need to be in order to conclude that one of the major political parties in the United States has long abandoned any semblance of good faith.
If you think this is only true of one of those parties, you're part of the problem.
However its current political enemies are not interested in a constructive debate with a shared goal of finding the truth. These are extremists that can think of nothing else but the destruction of their ideological opponents. They will destroy everything including the concept of truth as long as they see an opportunity for a temporary victory or more publicity.