Science is far too diverse to categorize all scientists as one thing or another. The scientific process is our best (and really only tool) for determining what is physically true. Yes, scientists can abuse the process, or choose to disregard some evidence, but this kind of science won't stand up to peer review.
Good public policy should involve decisions based on fact, and that means a system where politicians, who make our decisions, are well informed by the scientific community, and the public understands through the media not only the facts but the reasons behind implementing them as policy. Of course this isn't really what we have today.