The bait-and-switch rhetorical tactics from the cranks like "not a science" is to feign that empirical evidence doesn't exist (for thee) and therefore we should embrace ideology (theirs). This is why the Is-ought problem is frequently brought up. Though this mostly only flies in sloppy online space; in academia, progressives became Rawls acolytes and eschewed Marx, because of baggage and serious errors that can't be overcome. This seems to have translated to a chimera everything-bagel ideology on social media, where they're Rawlsian (qua social justice) but also many don't want to give up Marx, 'cause Capitalism bad, and this doesn't square.