I don’t presume to know your situation or the people you’ve dealt with so I’ll be charitable and imagine you cut your losses and quit similar situations in good faith, but you and I are both ignorant about the lives of others. It seems to me like the behavior you label an abandonment of principle leaves the door open to future redemption of a loved one. That’s worth fighting for. On that ground, I think you should stop sharing this opinion even if it’s true for you. If they don’t want to damn their own mother to a propoganda echo chamber full of malice then I’m rooting for them.