Corporations being only "groups of people" is kind of wishful thinking. They are one cog in a large machinery that is steered by a few very rich people.

Corporations should not be absolved of criticism. But at the same time it makes little sense to put a hamster in hamster wheel and then blame him for running.

>Democracy works best as a diffuse institution and is more than just voting. People are supposed to have rights and power themselves

People holding power themselves is called self-governance (in the Jeffersonian way).

People voting for representation is called a republic.

People voting away their own power to another is called democracy.