I don't think the point has ever been that short term speculators are doing the wrong it, people do what they want to do with their money, nobody tells them what to do. The point is that it is difficult to predict BTC in the short term, so the risk is higher in the short term, especially if you need the money you invested quickly, you may be forced to sell when you are at a loss.

Each to their own, buy and sell when you want to, but the right thing to do is to buy BTC with money you don't need anytime soon, so you'll be able to store it for a long time and not be forced to sell prematurely.