GOOGL is up like 25% over the last few weeks after they resolved the DoJ lawsuit about Search bundling. Clearly there were some investors who thought that was a material risk to the business.
Tesla is clearly a meme stock though, and an example of how the market can say irrational longer than you can stay solvent.
That's why passive index funds and a hands off approach are so often recommended. You cannot really mess up much by buying the whole market and then sitting on it long enough.
Saying it’s “right” based on outcome alone is like saying ~half the people in Vegas and betting on black made a good decision. You can win and still have made a poor decision.
A better approach is to look at the full range of your bets and try and decide if the betting strategy was good. But that gets difficult when you consider outcomes are linked through wider economic trends.
Tesla is clearly a meme stock though, and an example of how the market can say irrational longer than you can stay solvent.