Citizens have been able to sue the Government for a long time, English law is littered with cases where Citizens have won against the state for hundreds of years.
The whole point of a free state is that the entities within that state, people or groups of people (for example, companies) are able to keep their rulers in check.
Let's remember, the Government is sometimes wrong and needs to be kept in check.
Citizens are people. Companies (regardless of mind-boggling US Supreme Court rulings otherwise) are not people. They are not even groups of equal people. Representative democracies represent people, not companies, and that's precisely how it should be. How companies are expected to behave in our societies should be decided by the people.
You know what, I'm starting to think we should make use of that US Supreme Court decision and the ISDS trade rules. Activists incorporating companies in the fields they are interested in, using them as platforms to sue the government for lack of a fair market (for example, starting a renewable energy company and suing over the subsidies given to the fossil fuel industries). Perhaps that'd be an effective way to get these deals rejected or renegotiated (and that includes the existing deals containing ISDS, such as NAFTA).
The whole point of a free state is that the entities within that state, people or groups of people (for example, companies) are able to keep their rulers in check.
Let's remember, the Government is sometimes wrong and needs to be kept in check.