of course humans will not support cap side.If it had been explicitly voluntary and with guarantees, or at least checks and balances, that it wouldn't be abused, then it would've been a good idea. However, the chances of the SHRA not being inevitably abused went out the window with the first issue of Civil War when Maria Hill ordered Captain America arrested for merely raising his objections to the idea of a law that would require him to throw his comrades under the proverbial bus and treat them like criminals when they'd spent years saving lives, protecting the innocent, and fighting evil side by side, not to mention his valid concerns that amoral politicians with amoral agendas rooted in greed and power lust would co-opt them all to serve said agendas.
There was no hope left for compromise when the push for the SHRA was spearheaded and enforced by someone who thought that objecting to a law without said law actually being passed yet or necessarily expressing intent to violate it was reasonable grounds for preemptive detention. Frankly, though, I thought Cap should've just went public with what Hill tried to do to him and thus forced her and anyone supporting or siding with her to explain themselves and justify those actions to the media and the people. That would've resulted in support for the SHRA, with heavy-handed tactics like that being used, being seriously questioned and even lessened, and without going renegade and giving the pro-registration forces an excuse for what they did later.