There is no secret society killing the public.
The usual suspects are more than enough to do them in.
Irrational decisions, poor preparation, in too late, in too long, too much leverage and ignorance, not enough capital or common sense, death by commission, death by fees, death by the spread.
When the public plays the market, they are like amateurs sitting down with professionals at a poker game. Transaction costs are the ante. The players make the pot. When it's hackers and dabblers vs. seasoned pros, who do you expect to lose their shirt?