Why not if we can do it why shouldn't we it is just like helping them for their future expenses so why shouldn't we do it if we could save some.
I work very hard for my Bitcoins, why should I save my Bitcoins for other people to use when I could use them myself?
First of all, we need to use for ourselves because we are working for this. Well, if there are a few coins left, it will be possible to give them to children.