Discourses do matter and the way we talk about things matters. If you want to make serious change, like with the climate, then using discourses that divide people will never work. We must find the universal humanism in causes and allow people to look inside to find the truth. We can't just coerce people into compliance, especially with how connected people are today and the ability for opposition ideas to take hold much more easily today than historically using hysterics and tribalism to delegitimize each other.
Regardless, the backlash to it is potentially so much more damaging and I hope these people understand the type of fire they're playing with. Identity politics plays both ways and mixed in with classic conflict theory, well it doesn't tend to end well.
I'm optimistic that as these frameworks for how the world works are (easily) exposed as the frauds they are and how they are hurtful to a society versus other methods (like universalism and liberal-science approaches) which have worked and will continue to, we'll taper down a bit the discourses. There's some good bits in these philosophies too, to be sure and hopefully they survive.
In the end they'll fail because they have no way of constructing a coherent, functional world, much less a peaceful multicultural one. It's just a matter of how many people die to get to that realization.