That's a good question and not just with trading it is applicable but also in investing.
It is just the same as asking if we can really afford to take a risk and lose money. If the idea raises doubts in our minds, the best thing is not to continue. We don't want to be like those traders, and despite knowing their capabilities, they force themselves to do it.
These traders that are still doing it despite that they've lost a lot already is either in their early days and are testing themselves. But if a trader is going backwards and just losing more money. It's best for these type of traders to quit and stay with investing. It's true that the question simply asking about if we can afford to lose that money and take that risk and let ourselves be in those trades. It's not about how many traders we do but how profitable we are. Although in reality, the majority is in losses and are not profitable.