You can't put a trigger guard on a razor or a sharp knife.You misunderstood. If you have a pistol in the home, but it does not have a magazine, and a round has not been chambered, the 2 year old can shoot anyone, so no need for a trigger guard. If you have children in the home, you do not store poisons in a sippy cup, leave sharp knives, razors in easy to access places. You don't store farmers matches in the same cupboard as your spare gasoline cans.
You won't need a trigger guard equilient for the loose razor blades and sharp knives, or poison laced sippy cups, if you do not leave these around for the kids to get into in the first place. You don't need trigger guards if you do not leave pistols loaded with magazines with chambered with a round, laying around.
People in America have to either use the trigger guard for the gun or make the sacrifice I mentioned as the cost of liberty on guns. These two dead 'persons' are a small sacrifice to make for the purpose of being ready for the bad two year old bad guy.
If your AR has a trigger lock on it, you might as well have a sharp stick for stopping the shooter.