You can try to help people, in fact you should always try to help people whenever you can. It feels great, it’s the right thing to do and it creates good karma. However, you need to realize when to cut your losses. People who refuse to help themselves will latch onto you like a leech and suck you dry. They’ll take all the free help you offer, but as soon as you aren’t doing the work for them they will instantly revert back to their old ways.