In situations like this, I think the person at the top of the chain that told employees to perform the illegal installations should be arrested and charged. On top of that, the company should be fined into bankruptcy. If the directors knew about it any companies they're involved with shouldn't be allowed to conduct future business in the municipality (or state).
The system needs to be way more even when it comes to dealing with individuals and companies of every size possible.
For me the important thing is that the buck needs to stop somewhere human in certain cases. And in doubt that should be the CEO, potentially even multiple people at once.
If we want a free market where new players can enter and compete, big corporations needs to fear harsher punishment not lighter ones.