When ever a particular theory is pushed for political gain the scientific process gets corrupted. The side being supported will get lots of funding while the other struggles encouraging researchers to backup the supported theory or risk loosing funding. The result is that the supported theory is given the appearance of being overwhelmingly supported by the evidence, even if it is not. Furthermore support or opposition for the theory becomes based more on politics than science. The result is that it becomes hard to find the truth, because no one is unbiased
The worst example of the politicization of Science is of Man caused Global Warming theory, which is favored by politicians who see it as an excuse for increased government control. More conservative politicians tend to oppose this idea of global warming because of the associated big government political agenda associated with it.
However there is not only scientific against man caused global warming but the entire global warming theory as well. There evidence also indicates that the solutions being pushed by global warming proponents are the worst way to dale with it even if their science is right.
The point is that the politicization of global warming has greatly hampered the scientific process by hiding and distorting facts making it hard to find the truth. This is bad for and destructive to science. As a result when ever science is politicized the process of science is damaged.