Hmm maybe what you're intuiting is a divergence from neutrality on both sides. I wonder if you would've found more polarization if you'd had 4 ordered options each time (SUPPORT!, support, don't, DON'T!).
Could do another poll that asks something like "compared to X years ago, do you support Y:
- way more
- maybe a lil more
- maybe a lil less
- way less
?"