I certainly do remember 2008. When the market tanked I threw $10k into a Roth IRA, all into a managed fund considered 'safe'. In early 2009 I contributed $5k more. I made no customizations, and didn't contribute again (or even look at it) for four years. Whatever demons run that fund had gotten me a 60% return in those 4 years, and it's certainly outpaced inflation since. No matter how corrupt Wall street may be, they did far better for me and my puny $15K than I myself possibly could while holding down a full time job (during that same time frame, my hand picked stocks only gained 15%). While my normal pre-tax retirement fund has grown less dramatically (probably because I customized it a bit, oddly enough to try and avoid fees), it has still averaged 7%/year. Good enough, considering that inflation is barely at 1% and interest rates are so low savings accounts are a fool's errand.
Don't get me wrong, I know there is corruption. But (1) It's good enough for me and (2) it's not like there is an alternative we can point to and say "let's do that instead". There's stock markets all over the world, yet ours is the one that investors flock to. If the corruption was truly that terrible, any one of the many markets in other countries would be outshining ours, and people would be putting their money there instead.