That is not that much of a problem, is it? Any annoying American anti-science wingnut (and what about non-Americans, are they not annoying?) is easily blocked so in that respect not that much has changed. The widening of the Overton window will bring in more of those who previously were censored but that does not make them all - or even most of them - anti-science wingnuts. They just hold opinions which hitherto were deigned off-limits on ideological grounds. As far as I'm concerned this should improve the quality of the discourse instead of diminish it since ideology tends to be more of a hindrance than a help there. That is what the scientific method is about after all: careful observation, applying rigorous scepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation. I want my observations to be scrutinised by those who look at things from a different perspective because they may see problems which I'm likely to overlook. The opposite is true as well, I will see holes which they are likely to overlook.