#1) Speculators/traders have not necessarily done nothing else in life but speculate. You could say that about traders who work for trading firms, but there are many individual speculators/traders who have day jobs.
#2) Speculators/traders provide a valuable service in the stock market, even though that isn't their intention. They provide liquidity. This means that if you want to invest, as in buying or selling, you can be certain you'll find someone to take the other side of the trade quickly and at a reasonable price.
#3) It's true that speculators/traders can make money in both directions, but they can also lose a lot of money in both directions.
...capital they have to quit. There's nothing "unreal" about losing hard...