>We have plenty of examples

The issue isn't that we have plenty of examples (which is actually a handful, people always go to the same 2 or 3 cases, but I digress), it's that we have orders of magnitude more counter-examples that are ignored.

It's important to not build your world view on headlines, because headlines are headlines because they are outliers. It's not news when companies competitively adjust prices, it happens thousands of times a day all over the economy. If there was an "undercut on price" button in business meetings, you wouldn't even be able to read the text on it it would be so worn out.

There's more than 2 or 3 here for you to review: https://en.wikipedia.org/wiki/List_of_price_fixing_cases

Your worldview is incredibly naive if it doesn't include substantial collusion and cooperation among the capital class.