What you don't see are all the cases of business failing resulting in total loss of capital. What you see, you see because it worked out. But for every single startup that survived are 5-10 that don't.
Capitalists have done incalculable harm to our environment, society, and individuals
First, generalization like that caused incomprehensible harm to many societies. This sort of generalization was foundation of Fascism, then Nazism, and then Holocaust.
Second, while imperfect, that capitalist system works. I've seen no other system that would reconcile the incentives of multiple egoistic parties. None. Every utopian design fails miserably when inevitably some people turn to be assholes.
How about labor getting their fair share of loss if business they work in fails. No? Why not?
And you haven't proposed any better system. It's always the same when I ask that question.
But I'll satisfy your curiosity. I am a capitalist. I run super small business. If you think it's sunshine and rainbow, you're sorely mistaken. It's more work, there's no pay guarantee, competition is ALWAYS ahead of you, in capital, scale and know-how, you're sweating shitless on any change in costs, because raising prices always comes at the risk of losing customers, meanwhile you're required to do shit ton of government mandated paperwork.
But I'm still in favor of capitalism. Because my parents and grandparents lived in socialism and told me how their life looked like. Long story short: It was an inescapable poverty and no free speech. That's how alternatives really look like.