There's always at least one RO/RSO per shooter and they are supposed to control the situation. The events are expressly intended to allow brand new shooters to compete--so they are also designed to be run so that brand new shooters can show up and shoot without causing unsafe situations. In the matches I've attended, that's how it has always worked.
Shooters are given frequent and very specific commands--how to place the gun case on the shooting bench, which direction the gun should be pointed when the case is opened, safe directions, what to do when the string is ended, etc. and are very closely supervised.
If there is unsafe gun handling at GSSF matches, the fault lies in the ROs/RSOs who are failing to do the job they agreed to.
I guess, in one sense, there's some truth to your comment. Since the matches do get brand new shooters (as intended), and since someone who has no experience handling guns is unlikely to do a great job of it on their first try If they are unsupervised, one could blame the people who show up. However, since the matches are specifically designed to be friendly to brand new shooters, there's no excuse for the ROs not providing the supervision/control necessary to keep things safe. Especially since there's always at least a one-to-one ratio of RO/RSO per shooter.