What use is an economy if there is no population to make use of it?
If lack of regulation is the reason water supplies is getting poisoned then logic suggest that regulation should be used to punish irresponsible companies of falling short on their obligations.
That includes Banks.
You can't just give a child a candy when they're behaving good and expect that to form obedience and discipline, you need to be balanced and punish them when they're being beligerant.
Business is that child, you keep giving and giving, eventually you end up with irresponsible business because they've never felt the trauma of being told No.