The market is highly regulated in large part due to the notion that "manipulation" occurs (spoiler: it does, but manipulation always fails on its own eventually and the crash is typically made worse by regulators). Restrictions are made on who can invest, when and how much to the point where it's not a surprise that average wage earners avoid doing so - most of the worthwhile options are only for millionaires or higher. No wonder so many think the markets don't work - they can scarcely be considered markets!
Allow people to be educated and learn how to handle their finances rather than being protected from all danger to the point of being locked out, and you'll have informed individuals capable of handling their own affairs. Let Johnny touch the stove to see that it's hot and he'll learn right quick!
Socialism just wants to save everyone from themselves without looking in the mirror and realizing how dysfunctional it is itself. Forced collectives self destruct; voluntary cooperation survives and thrives, but it takes effort and time instead of a quick fix.