Nobody is claiming that success is 100% attributable to luck. The claim is that becoming rich and famous is mostly luck-driven (see the quote in OP's comment),

Nobody is claiming that success is 100% attributable to luck. The claim is that becoming rich and famous is mostly luck-driven (see the quote in OP's comment), which I think is absolutely true. Believing otherwise leads the rich and famous to think that they are better than everyone else, and the less successful to think that they are inherently inferior, when in reality there is a wide overlap in effort, dedication, and strategy between the two groups. One group was just in the right place at the right time while applying those skills, and the other wasn't. In other words, not becoming rich and famous is not a personal failing. Sometimes you can try anyone's best and simply not succeed.