Because if you jam your surrogate phallus down your pants, you won't have a pp anymore.
Argue for why you carry the way you do. I'll start.
I use the 5-11 Select fanny pack because the only pistol I have is a full-size Glock 22, which would make me look super happy to see everyone if I put it in my waistband.
The idea is you got that thang in your haand because in a high stress scenario, your butthole clenches making it difficult to draw. However there is a positive tradeoff as it automatically increases the retention capability if an attacker tries to disarm you.