No, citizens are the opposition to the GOP

What country are you from? In the United States we have a form of Government known as a 'Representative Republic'. A type of Democracy where the people elect representatives to enact our will in Government. The people who the citizens elected to oppose the GOP are the Democrats. It is very much their responsibility.

That doesn't mean that citizens shouldn't make our voices heard as well, I encourage them to do so, especially in light of all the do-nothing Dems not doing jack shit to stop them.

The citizens’ work of putting pressure on the government would have been so much easier right now had “both sides” mentality not elected Donald.

This narrative needs to die. Yes, a significant portion of Americans believe that both sides are bad, and with good reason, but the ones that believe that are not so stupid as to think that both sides are equally bad, and didn't vote for Trump. It was the millions of Americans who are cool with a fascist dictatorship that voted for Trump, and they don't believe their side is bad. The rest of us held our noses and voted for Harris despite her being far from Ideal. All of the people who didn't vote were never going to vote in the first place. People are fully capable of believing both sides are bad, but one side is objectively better at the same time. It's called harm reduction.

Had Harris won, criticism of democrats would have been far more effective.

In what way exactly? If they are fully willing to ignore the will of the people now, what makes you think they would not ignore the will of the people if they were in power? It makes no sense.