Capitalists can only make life better for each other or do nothing

Exploitation is not a requirement of Capitalism.

It is perfectly possible for two Capitalists to engage in a transaction where neither one of them is exploited. If there has been no violence (both are consenting) then where can be the exploitation? Perhaps we are 'exploited' by the Earth when we have no food or shelter, but not by Capitalists. Have we been excluded from the land by Capitalists, or by those who control property rights, who are the State?

Exploitation is impossible under Capitalism, provided property rights are properly controlled and managed...

The Capitalists are only able to improve the lives of each other, or failing that, have no impact. We cannot be harmed by a (true) Capitalist.