>The Robinson-Patman Act made it illegal to give preferential treatment to large retailers specifically in order to prevent what we're seeing with walmart and amazon today.
Price collusion is illegal too, but happens all the time. There being a law for it just makes the rare fine a cost of doing business.
I wish that were true, but mass murderers like Johnson & Johnson, DuPont, Philip Morris, the Sackler family, etc. are allowed to keep on killing people and face no meaningful consequences for the deaths they cause. With enough money you can be a serial killer for decades and get away with it.
Corporate punishments can be applied on a fine grain. Every store, every instance, every choice becoming a 10k fine can rapidly make even relatively rare acts untenable as a cost of doing business.
Price collusion is illegal too, but happens all the time. There being a law for it just makes the rare fine a cost of doing business.