Name all of the non-politically charged areas of scientific study where you will be attacked for being a fence-sitter because the data and methods aren't robust enough yet.
Now do the same for the politically charged ones. See the difference? That attitude bleeds over into the research that the scientists do, like it or not. It's a similar story in business research.
When there is absolutely no preference for outcome, there is no bias. When researchers, shareholders, investors, etc. have a vested interested in seeing a preferable outcome,
that often affects the results. Research doesn't happen in a vacuum (inb4 astronomy joke).
I'm not a "denier" and I'm not an advocate, yet for some reason I'm labeled a heretic for not immediately accepting the results of admittedly flawed, evolving research with a strong political bias (with hard to obtain raw data to boot) this early in the game. That's bull crap.