"Be grateful for whoever comes, because each has been sent as a guide from beyond"
I take your point, so eloquently put by Rumi. But selfish people can be so frustrating because in general they are unhappy (and complaining about it) and you want them to realise that the way to happiness is through giving to others. They have to learn this for themselves. Time is limited - and best to focus on people who really do need help or 'awake' people who can help you.
Just a few words and a picture.