This. Too many free-market capitalism anti-government evangelists miss that most of the 'bad'/immoral bits of behavior by producers is completely natural and rational. A cartel is just effective cooperation.
The point is not to get rid of capitalism or free markets, but to acknowledge the strengths and weaknesses and effectively channel those. Given where Western developed countries are today, that means more regulation (and enforcement) and even nationalisation of certain aspects of society.
I disagree with your conclusion. We don't need "more", we need "better"... and a key aspect of the "better" we need is that we need more focus on identifying and addressing regulatory capture.
Anti-trust law is largely a bust. You can't point to any case in American history, for example (I'm guessing you're not American, but I reach for the history I know; if you have good counterexamples from elsewhere I'd love to hear about them), where there was an abusive monopoly and the government stepped in and fixed it. What happened in every single case is that market forces were already taking down the monopoly by the time the government took action. I don't think anti-trust law is bad, per se, I think it defines some useful boundaries and probably warns a lot of companies away from abusive behavior just by defining clearly what is abusive. But I think the effect is ultimately just to decrease the amount of abusive behavior that happens before the market takes the monopoly down, which would happen even without the laws.
The real exception, the case where you get long-running, entrenched monopolies that the market doesn't eventually undermine, is when government regulation creates or maintains the monopoly. And the more regulation you have, the easier it is for industry to get that regulation tweaked in its favor. We need regular and intense scrutiny of possible cases of regulatory capture, and then we need to refine the regulatory regime to prevent capture -- the best way to do that in most cases is simply not to give regulators the type of power that businesses can exploit. Note that I said "type", as in "kind", not as in "degree". I'm not arguing for weak regulations, I'm arguing for regulations that primarily focus on shining a bright light on corporate operations, rather than regulations that control or restrict.
The primary role of regulation in business operations should be to ensure that companies operate with honest and full disclosure, of their financials, of their labor practices, of their product quality and characteristics, etc. Note that it's also important to ensure that the regulatory burden of information disclosure doesn't become another form of capture, preventing the entry of small players who don't have the necessary expertise to fill out all of the necessary forms.
Nationalization is its own can of worms, unrelated to regulation. It's generally a bad idea, though. In theory it seems like a good idea to eliminate the profit-taking that private enterprise necessarily engages in, but the savings that provides are basically always swamped by inefficiency created by the reduced need to be competitive.
Obviously, there are exceptions; industries with natural monopolies, where control-oriented regulation or even nationalization make sense. Most of these are near-universally government-run already, such as road networks and air traffic control. Utilities, however, aren't really natural monopolies, even though they're generally treated as such. The last-mile delivery of power, water, etc., are natural monopolies (we don't want five water companies digging up our streets to install their own pipes), but the industries as a whole aren't, and shouldn't be treated that way.
Above all, I think market regulation should focus on enhancing transparency (which is what prevents bad behavior) and removing barriers to competition. Markets are the most powerful mechanism we've found for reducing poverty and increasing wealth. Harness them, don't hobble them.