You're creating a false dichotomy. Either one or the other. Either the unregistered sign, or they're anarchists. It is possible for democracy to exist but for bad laws and unjust, inhumane treatment to exist simultaneously. It is not undemocratic to fight an unjust law, particularly within a society where free speech, the right to peaceful protest and the right to due process exists. Squelching protest, the way the pro-registration side did, was NOT democratic nor were Reed, Stark and Skrull!Pym trying to uphold democracy, they were creating a state of martial law, which is about as undemocratic as you can get. Those with superpowers were told they had to sign (wherein the pro-registration side knocked on Jessica Jones' door in the middle of the night and told her she HAD to sign or else, even though she had no intentions of being a superhero at that time as she had JUST had a baby)...
Or they were thrown into a prison with dirt floors, and no beds, denied medical treatment, where the prison was located in an area that slowly drove those who inhibited it insane...
It is not undemocratic to say, this is wrong, and refuse to sign. Protesting is pointing out that there is a flaw in the system that needs to be fixed.
Obama, himself, thought the SHRA to be unconstitutional...
Because. it. was.
Keep in mind that SHIELD starting enforcing the SHRA before the thing had even passed. When Hill open fired on Steve for refusing to arrest anyone who didn't sign, the SHRA hadn't even gone through congress yet.