They still make some models without the hole, which makes the reasoning harder to figure. Here's my recently purchased (factory new) Model 442, sans Hillary Hole. With this model, it's an option to get one with or without the hole, buyer's choice. I have to think that the only people who buy the ones with the hole aren't aware that not having it is an option.

[Linked Image]

If they can sell these with the no hole option, why not all other models, too? I guess they consider the double-action-only feature to be safe enough for the masses without a key lock.