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I agree with your concern, but I think that you shouldn't limit your fear to party-aligned attacks.
For example, the Thirty-Meter Telescope in Hawaii was delayed by protests from a group of people who are most definitely "liberal" on the "liberal/conservative" spectrum (in fact, "ultra-liberal"). The effect of the protests is definitely significant. While it's debatable how close the TMT came to cancelation, the current plan is to grant no more land to astronomy atop Mauna Kea.
Agreed. There are plenty of liberal views that reject certain scientific evidence for ideological reasons--I'll refrain from examples to avoid getting too political, but it's not a one-sided issue.