Politicians look at best at next term, CEOs look at next quarter. Climate changes took decades to manifest effects. And those 2 groups produce most news "worthy" messages. Journalism is quite close to being dead (with local reporting already being buried), as rephrasing PR statements is cheapest and fastest way to produce "content". Who is supposed to nudge public discourse in that direction, "influencers"?

I'm puzzled why you think it isn't.

Do you mean how it is verboten to suggest that mass migration would cause conflicts or be at all problematic?

Not sure, but I have heard that more than plenty in public discourse (NL / W-Eur) and even the repeated blatant lies about the 2015 wave of migration to be due to climate change.