Earlier quoted context omitted.
Isn't the risk of losses supposedly why capital holders make a profit at all? So they shouldn't be paid twice for it.
The capital being invested has already been taxed at the source. Capital gains shouldn’t even be taxed. I earned it, paid taxes on it; what I do with it beyond that is no one’s business. I’m the one taking the risk yet the government benefits if that risk pays off but doesn’t compensate me if it doesn’t.
Your second sentence applies to labor as well: "I'm the one doing the work, yet the government benefits..."
Either "all taxation is theft", or "taxation is the government charging for providing the services necessary for work and business to operate".