To be fair, sliced bread (the square stuff that's used to make sarnies and toasties) should not be called bread. Never mind the legal definition. It's a mess of supplements and emulsifiers and stabilisers and whatever. Yet, you can make perfectly good, delicious bread with only flour and water (not even salt, let alone sugar).
Why are all that other stuff in sliced "bread", then? Probably because they improve shelf life or make the product resemble some ideal of "bread" that has been created by marketing teams and promoted by advertisements showing fake bread behaving in a certain way in different cooking conditions (oooh, look at how crisp those bread slices are as they pop out of the toaster!) (wait, why does your toaster have a strobing red light slit?).
In short, that sliced "bread" is not bread, it's a product that masquerades as bread for the purpose of being sold to people who want to buy actual bread. It's like a, a, a mimetic parasite that pretends to be one kind of animal when it is another so that it can more easily approach its host. It's like a cookoo egg that will hatch to a cookoo fledgling that will throw all other eggs outside the nest so it can hogg their parents' attention. It's like a synthetic hormone, or protein, that binds onto the receptors that are meant for the real thing and inhibits the real thing's action. It replaces true bread in the baskets and the bellies and the minds of people, until nobody buys true bread anymore becase it looks ...weird and not like what they're now used to call bread, and everybody buys that fake bread shit instead, that the fake bread makers prefer to sell over true bread, because it makes them more money.
Sure, that sort of stuff should not be allowed to be sold as bread in the first place. It should be forced to have big, red labels on its packaging stating clearly "THIS IS NOT REAL BREAD". When consumer goes to supermarket to buy bread, because they want to buy bread, they should be informed that what they are about to buy is not bread- then they can make their choice whether to buy it or not.