Most people accept that science in past generations was, to a certain degree, corrupted by the prevailing prejudices and societal/cultural/political/ideological beliefs of the time.
But, if we acknowledge that was true then – why shouldn't we expect the same to be true now? The prevailing prejudices and ideologies may have changed, but has anything changed about the actual practice of science to make it more immune to those forces? I think a lot of people can't see it, because it is far easier to see when science is being influenced by beliefs you reject than when it is being influenced by beliefs you yourself share.
I think the politicisation of science is inevitable, and science is never going to be entirely politically neutral. Scientists are human beings, and as Aristotle famously said, "man is a political animal". I think science is going to achieve the maximum possible political neutrality when it is either (a) things so clearly established no one can sensibly debate them (which especially happens when scientific theories get translated into widely adopted working technologies–the very fact that the technology works is proof the theories behind it must be mostly correct); (b) things that avoid political entanglements because they have little relevance to everyday human life (e.g. string theory vs loop quantum gravity isn't influenced by broader societal politics because it has no relevance to issues of social/cultural/economic/political power, although even it is surely influenced by the micro-politics of the theoretical physics community, its funding models, etc.)
Take something like human-induced climate change – personally, I accept the mainstream account of that topic as most likely to be correct, but I can't be completely sure that it is right, surely there is some non-zero probability (even if a small one) that it is wrong. But, I expect people in a couple of centuries from now will be able to reach a much firmer consensus – they'll know whose predictions turned out to be right, plus technological and economic developments will likely greatly reduce the number of people with a vested economic interest in the non-mainstream answer. I think the most likely outcome will be that the mainstream account will be vindicated, and almost everyone will acknowledge that the minority were wrong; but it isn't absolutely impossible that it could turn out the other way around. And whichever way it turns out, I think people will see politics as having played a major role – if the mainstream account is confirmed, people will see much of the opposing minority as being led astray by politics; but, conversely, if the sceptical minority turn out to have been right all along, people will reach the same conclusion with respect to today's mainstream.