I have a 580 Barrage that has to be a hundred years old, it's so beat up, and I can't possibly see how the sliding safety lock can engage by mistake. I mean, I literally have to press down and push with a fair amount of force to get the damn thing to move and by mistake? Nah, not gonna happen.
I know the blade comes out fast and hard enough that I wouldn't want it accidentally opening in my pocket and skewering my leg or possibly much worse. However, if it bothers you, just take the knife apart and remove the lock, easy-peasy. There's tons of you-tubes to show you how.