Liberals have to come up with new transgressions all the time for several reasons. Number one, liberals are perpertually trying to create victims to support the cause through donations or votes. More victims, more power for Dem pols.
Secondly, liberals themselves like to think of themselves as perpetual victims of an awful, racist, sexist, etc. group of people (right-wingers) who have created this godawful nasty country where dark people like Oprah Winfrey are forced to live on several billion dollars.
You would think that after libs had won all the battles they'd be satisfied. But being a liberal means always seeing the glass as half empty. Things are never good enough, never just enough, never fair enough. Somebody has to be blamed for the failure of many of the lib's pet groups to succeed.
Since there will always be people who disagree with the lunatic goals of the lib/progressive movement, i.e. conservatives, there will always be other people for libs to blame for their failures.