Your argument is a strawman - but yes, ideally this would come via additional taxation or regulation of investment (which we do now, but not well enough).
That would restrict access to early investment deals and opportunities for regular folks even more (today you have to be a "certified" investor) in turn increasing wealth inequality and social mobility.
black/white fallacy
Someone has a million in index funds and earns more than a Walmart worker by "sitting on their ass". Are you proposing a ban to that?
limit != ban
Capital gains taxes don't prevent an investor from making money.
They do disincentivize and thus reduce the investment in the area though. An area which helps the economy grow and in process creates good services and jobs for everybody.
You really need to learn how to respond to arguments without constructing strawmen. You can't get to a resolution of different viewpoints by misrepresenting the opposing argument