You don't seem to understand. I did not mean that they represent the janitor and the mail lady. I mean they are legal entities that represent the owners of the corporation which is nothing more than a bunch of fancy words around a shared banking account and the grouping of a specific subset of the assets owned by the owners. They are owned either by single individuals, sometimes the CEO, or small groups of individuals. Or in the case of publicly traded companies possibly more with enough shares to matter. The CEO is chosen to represent these owners wishes and if he misrepresents the politics of the owners they have many legal methods to straighten that mess out. "the CEO and a couple of other executives" are 100% accountable to the owners.
Corporations are just legal jargon that simplify a system into a metaphor with personification. This group of individuals who have a shared objective and assets that they own together, get represented together as a single individual under the law for tax/financial/accounting/easy of use reasons. But at the end of the day if you get rid of corporation, while it would making managing one far harder without a separate bank account, etc adnausium. They could still easily donate to political causes because the owner(s) would just take some of the money which is theirs and donate it to the politician directly.