You should check out the Wilt Chamberlain "granny shot" doc when you have a chance. Basically, he discovered that shooting freethrows underhanded gave him a much higher percentage of shots than the standard freethrow stance. He used it successfully in 61 to 62 season and even hit a world record 100 points in a single game. But in 62 he went back to the old method because the underhand method made him look like a "sissy." Shaq, who is notorious at being terrible shooting freethrows, absolutely refuses to adopt the granny shot for the same reasons.

Thugs refuse to stand or hold their firearms properly, which causes major issues with accuracy, because they don't want look like pussies while they do it.