Way too broad a statement. Leftists regard themselves as part of a movement. Anything can be justified if it can be portrayed as furthering the movement toward its goals. The vast majority of Americans don't believe that. Voters in Weiner's district would prefer that he not have acted in that manner, but they were making a cost-benefit judgment. This demonstrates the extent to which decent people have been enslaved by the political system.
Not broad at all as your explanation clarifies. The liberal movement fosters loosened morality, spendthrift economics and radical democracy. How is my comment too road?