If that 20% does not include those raising kids, then it's crazy high. People should be free to live their own lives and make their own choices. And those with nurturing instincts should be well compensated to care for those we can't or won't tend to 24-7. No one should be alone with around the clock care of another human.
Of course we should all pitch in with whatever capacities we do have. But it must not be all consuming. And not block off our own opportunities to a life of our own.