Sorry, a, but for all the short term damage it may entail, the success of one company at the expense of another still represents a net benefit because the consumer wins from keen competition, which drives up standards and forces down price.
And the undertaker example is silly because it posits an external factor as a critique of market forces: namely a spike in mortality. Even then the market works, though. A spike in deaths is not only good for undertakers, it means greater demand for labour, which means higher average wages, lower demand for goods and thus lower prices. Again, it's a net win.
Capitalism works, a. The market works. Really fücking well. Sorry, but it does.
Right up until some cöck of a politician tries to put their thumb on the scale, of course.