First of all, it matters if the stock market is fulfilling its original intention. Which it obviously is. Second of all, some of the biggest traders on the stock market are pension funds of common workers, appreciating their retirement money. Fuck over how exactly?
And third, let’s say none of what I wrote is true. Why are we somehow better of not having a stock market at all instead of fixing it to fulfill its purpose? Or making a new one if it is easier? Do you regularly throw away things without getting a replacement when they stop working? Never replaced your car and phone after they got old and broke?