What was considered safe enough in 1873 is not what we consider safe today.
...
Well, it is a faithful reproduction.
Finger slips on that hammer before half cock or whatever? BANG!
This is not a modern firearm design.
Several inaccurate claims you have made. This is not how they work, at all.
1. Older style SAA revolvers are carried with the hammer resting on an empty chamber, and the firing pin would be resting directly on the primer. A strong blow (such as dropping) to the hammer could simulate the force of a fully cocked hammer and spring. Rare, but not impossible.
As far back as 1970, changes to such revolver designs were made that made to decouple the firing pin from the hammer
unless fully cocked (eg transfer bar mechanism). These are known throughout the industry as "New Model".
You
cannot drop a hammer and firing pin onto cartridge unless it's fully cocked
and you pull the trigger.
2.
The safety mechanism was not engaged in this accidental shooting. See the manual you linked.
The cylinder pin can be easily positioned so that even a fully cocked, fully loaded firearm will not fire because the hammer will strike the cyl pin
before the cartridge.
Again, another point of negligence in following safety practices, assuming they bought new firearms, and did not deliberately seek out old guns without these features.
The problem with old firearms is that hammer pull is difficult and strong, and if your a noob like me it is real easy to accidentally discharge.
3.
I don't know what rusty, broken firearms you used, but this is an absurd statement.
Unless abused, the hammer pull is not heavy, at all. Your finger should not be on the trigger until ready to fire, regardless of grip style.
The triggers in revolvers are fantastic. They are light, and break crisply. You do not put your finger there before you are ready tho.
These look like 1873 models, but there are many functional changes to add more safety layers in the event of the careless, ignorant, idiots and drunks shooting themselves and others. Congrats Alec, you managed to defeat all of them!