Investment income is taxed at a higher rate then wages. The investment income was earned as wages at some point and taxed that taxed money that is invested and actually earns a profit will be taxed at the corporate level currently 35% and it is going to be taxed as a capital gain or dividend when distributed all the while being eatin up by inflation just like the person he decided to put their's under a mattress.
Additionally the losses are restricted. Cap gains are taxed at a much higher rate then wages or money that's spent that doesn't get taxed at all since we don't have a federal sales tax.
So I don't agree with your premise that income from investments or losses from investments are the same as wages.