Earlier quoted context omitted.
I guess I'm questioning why the assumption is that they support drug laws because it makes them money. They may be supporting it for other reasons (strongly support law and order).
They have a duty to their shareholders to grow revenue and stay in business. If something threatens that, they will fight it. Like many other commercial enterprise they will spend money on lobbying to protect profits, in this case it is just particularly sickening how big the problem has become. https://www.youtube.com/watch?v=QsBDvxy5qQY
Do private prisons fight relaxing laws to make more money? I'm sure some do, but most don't.