installing brand new cartridge brakes, something seems fishy So I am installing a brand new cartridge brake pad assembly on my mountain bike. I noticed that the brakes have a left and right written on them so i install them properly. What seems fishy to me is that the cartridge slides in from the back of the bike.

This means that if i were to lose the pin holding the cartridge in place, next time i were to apply the brakes the cartridge would probably be pulled out of the holder because of friction.

This is the part that seems very counter intuitive to me. If that hole was in the front of the brakes, this scenario would never occur. This also leads me to believe that maybe the LEFT and RIGHT markers are suppose to be flipped.
The brake labels are correct, please don't ignore them.

When you're moving along the top of the wheel, where the brake is, is moving forwards. When the brakes touch the rims, the rims are trying to pull them further forwards, were the holes in the front, they'd be pulled straight out.