You don't need to be a qualified investor to invest in the general economy. Banks, mutual funds, and a dozen other easily accessible instruments willingly do that for you.
As for reduced taxes, I would argue that it seems like the ideal way to combat a global credit crunch. The government has the lowest cost of capital and the lowest default rate (at least the US govt. does). Thus it would be more efficient to leave the extra capital with private citizens and use deficit spending. Of course it would even more efficient to just not have the federal govt. spend as much but then its not like hell is about to freeze over anytime soon.
And honestly, reducing taxes even further in this crises doesn't strike me as a reasonable way to handle a global credit crunch...