You can cite science and demographic facts while leaving out your own overt normative opinions, yet you will still get downvoted from both 'sides' who think they are being slighted if you don't give a clear opinion. Unfortunately this is the way scientific method-driven experts talk (and generally anyone who's into political science rather than political opinion) - but in this domain it really sets non-experts off for some reason.
The thing is, most people are taught at a young age that their political opinion matters a lot, which probably has something to do with generalized experts walking into this domain thinking they're already experts and getting quickly frustrated when they realize they're not, lashing out at the source of that frustration via downvotes.
Back in the day the responses to these kinds of topics used to be via comments, now it's almost always via drive-by downvotes. I used to bemoan the inane buzzword replies back in the forum days because they were typically boring and predictable, but they were still infinitely better than the downvote without comment that is the norm for this site (and even more common on reddit).