> If you, or anyone else can be more rational, and predict the market's errors
You can't rationally predict irrational errors. At best you could have spotted the trend early and jumped off at the right time, but that is still speculating on the degree of irrationality.
If you can't predict them except in hindsight, well then how can you say it's irrational? If you can't tell me whether or not investing in Nintendo stocks has negative expected value, you shouldn't call people doing it irrational.
Of course there was. If a company produces the most successful mobile game of all time, and shows there is a huge interest in one of their IPs, you don't think their stock should be worth more?
