Going for the 3 point shot too early and too often can wreck a shooting style. Another old line is that kids from inner cities don't shoot particularly well because they grow up on playgrounds, places where there are bent rims without nets, places not conducive to breeding shooters. To learn reliable shot takes repetition and hours of practice. These days there are too many kids and too few courts. This is certainly one of the major reasons.
Defense is a statement, and it's tougher than ever to get an open jump shot.
These are valid reasons, and they explain some of the problem. There's no rush. It's not difficult, as evidenced by a few non-playing people, some in their 60's and 70's, setting records making thousands in a row. In this article, first of a series, I'd like to suggest two more reasons for the problem and offer some ideas that might help. It's thought it takes a long time to learn First, I believe it is thought it takes hundreds, maybe thousands, of hours to learn how to shoot well.