The takeover going through is the logical conclusion of free markets - a monopoly is very profitable for shareholders. All signs pointed to the market wanting this deal to go through, there was a Bloomberg article a couple weeks ago saying that half the votes counted indicated that all of Broadcom's candidates for the board would win.

The market is made of fallible humans with their individual goals, agendas, egos, whatever. It's not an organism of its own.

There's nothing about market systems that typically prevent stupid decisions. The market system, in theory and often in practice, delivers consequences from stupid decisions (see: IBM's current weakened condition and recent 23 straight quarters of contracting sales, while they blow all their profit on share buybacks and further concede the cloud biz - which they were early on - to AWS/Azure/Google).

There are no systems that do not consist of fallible humans. Whether we're talking traditional Socialism, Communism, Fascism, mixed systems, quasi free market, laissez faire.