it's better than to give than to receive

my mom told me that when someone is asking/borrowing money, i should not ask or question the person for what he/she will do with it. just give the money because that's what you called an unconditional help.
it's hard! what she's digging into is that i should help other people in need.
No matter the use if it will be for good or for bad.
i really can't understand why she is saying this.

an awkward example is, if my friend has an addiction to drugs, and to he is asking money from me begging for some because he needs it for some personnal use wherein i know that he will just buy some addictive drugs. will i still give him money for the sake of helping because his reason is he will use it for personnal use. maybe that reason is that he will use it for his mom's medicine?

what will i do? it's just like im feeding his liesure or his addictions?