[rue]

Some people will always fail to reach some goal the same way some may naturally gravitate to it whereas another may need a little work and yet another a lot of work to get there be the issue beating addiction or paying your bills on time.

"Free will" is not some state of consciousness that exists completely isolated from your biological processes, experiences etc. And, quite importantly, if something like it is assumed to exist, it will not be the same level of "free" for everyone.

That said, it is most certainly worth trying to reform one's bad habits. It is just not necessarily fair to make a moral judgment dependent on their success. Naturally this then extends to the bad habit of making moral judgments so I guess that gets us nowhere, which is pretty much how the universe works.