You are exactly right.
"Unless your main source of income is playing the markets (in which case you're pretty much a parasite anyways),"
Agree with your comments except for this characterization.
traders (people playing the markets) provide tremendous liqudity in our financial markets. Trading is not riskless - traders put their OWN or MPO capital at risk continuously.
Do you think the markets would function better if there were no traders at all? Would this help the average investor for the average volume in his stocks to get cut in half, or maybe much more on some small-caps? Can you imagine how much book depth would simply vanish if all the parasites quit?
I am not trying to characterize trading as some saintly occupation, but I do feel that your characterization misses the primary public benefit of having traders.
Secondly, if there were NO brokers, traders, or investors, American business would collapse.
Thirdly, The vast majority of Americans, in one way of another, now "plays the markets"!
Ergo, the two of you, who claim to be oh so above it all and call others "parasites", need to rethink your calling yourselves "CONSERVATIVES", because you aren't one!