Isn't there a limit to 'needing help'?

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All humans are dependant upon each other and it is a mandate to help fellow human beings. In fact there's a song where it said that : Did you share anyone else's joy and sorrow? Having been in the world full of misery, did you take it upon yourself to wipe off anyone's tears? I have needed help and been given a hand and I have done what I cu'ld for others...but here is my question: can anyone -except those who are disabled - need help permamantly? My idea of help was that: 1, It is voluntary -the party helping decides weather to help or not and when to start or stop, 2, It is time limited or event limited - it is dispensed for a defined time or till the person needing help meets a goal like finishing college or find a job etc... 3, The person being helped does follow common decency of not deliberately making situation worse or misuse the help. 4, Most importantly -there is an endpoint where the hepling party can feel done and move on with his/her own life. I know this discussion is too abstract but when I see a person, a family, a community or a country take help for granted and a permanant arrangement, I feel for the person who has no choice but keep providing. I am refering to people living on welfare generation after generation without giving tax-payers a choice about it, friends and family members who perpetually ask others to bail out while continuing self destructive behaviour, nations who stay dependant upon foriegn aids. etc. etc. What are your thoughts?