Many on the left explained that protests -- even when they became violent -- were the result of pent-up emotions brought on by an "illegitimate" war about which the demonstrators could do nothing and so they had to protest in sometimes the most extreme ways. Now when the right becomes angry about what it sees as the systematic dismantling of the country through higher taxes, misspending (by both parties) and tone deafness, it is supposed to be setting the stage for the next Timothy McVeigh and is somehow illegitimate and outside constitutional boundaries.
If you don't like President Obama's policies, you are a racist who is setting him up for assassination by a neo-Nazi who is waiting in the (right) wings for sufficient inspiration. You should be lying down and taking it, because Obama wants only the best for all Americans.
If you don't like what courts are doing -- legitimizing behavior that used to be called sinful before that word fell into disrepute -- you are a fundamentalist wacko who wants to impose your religion on the country.
If you think the Founders wanted to restrict the power of the federal government and that your taxes on hard work and initiative are too high, you are a greedy, uncaring person who disregards the poor and needy. If you think many of the poor and needy made wrong decisions about their lives which contributed to their poverty, and that by making right decisions they could better their circumstances, this proves you are insensitive, judgmental and a religious nut.
In this way of thinking, everything done by government when it is headed by leftists (though not by conservatives) is noble, righteous and good. If you disagree with any of it, you are opposing God, though of course to the left there is no real God. Government is God.
The left conveniently forgets people like the 1960s black-power apostle H. Rap Brown, who said, "Violence is American as cherry pie." No it isn't, but peaceful protest is.