I don’t know what the OP is getting at, frankly.
Can bad things happen with deregulation? Absolutely. But regulation has its costs as well - too much can choke off economic activity or drive it underground. Even leaving extreme examples like Communist countries aside - Great Britain in the 1970s was an economic basket case, and Ireland’s biggest export seemed to be people until it reformed its own economy a few years back.
I can as easily ask whether advocates of regulation have changed their tune given these examples - but that would be a question as broad and unanswerable as the OPs, so I won’t do so. What we ought to ask instead is what regulations are necessary for the operation of an otherwise free market.
I may have an opinion different from others on this board, frankly, but at least we’d move the discussion to a worthwhile area and not keep it at a juvenile level of badmouthing regulation and deregulation. Some of both are needed, some of both were poorly thought out, and it doesn’t take a genius to understand that.