The fact that Trump is a dipshit doesn't mean that the rest of us have to lose our minds. Many of my friends on social media have lost all ability to think or reason, and just pass through shoddy unsubstantiated articles as fact, which is sad because that's the problem with the POTUS that they are decrying in the first place. Fight idiocy with well sourced and reasoned explanations, and calm refusal to capitulate with the worst of it. Do not return in kind.
If you look at the Science and Security Board of the Bulletin, you'll see that only two of the 14 members have an atomic science background, and only two more have meaningful nuclear policy experience. This is very different from how it was when it started in 1945. Most of the people there now are environmental and public policy folks. Only 8/14 seem to have PhDs (what many would expect when you say "scientist").
It'd be more accurate to call it the Bulletin of Environmental Policy Scientists. In that lens their determination does make sense, as Trump will be nothing but bad for global warming. However a clock-to-midnight is a poor representation of a threat like that, which takes sustained and difficult work over a long period rather than a reduction of tensions to solve.
Apparently Elon Musk has tried to float the idea of a carbon tax with Trump. While unsuccessful so far, that's probably a bigger impact than the Bulletin will have during this administration.