Unless I misunderstand it seems you're pointing out a benefit of automated electronic trading, not HFT. Most people distinguish between the two when arguing that HFT is detrimental.
This critique of Michael Lewis recent book goes into HFTs: https://scottlocklin.wordpress.com/2014/04/04/michael-lewis-...
> Back in the days of pit traders, if you threw a huge order at the pit, you might get a fill on a couple of round lots. The rest of the pit is going to change their prices, because they figure anyone swinging 10,000 or 100,000 share orders around must be informed traders. If they’re informed traders, they need to pay for their immediacy. Informed traders may be criminal insider-trader creeps, they may be people with really good trading strategies; it doesn’t matter -they’re informed somehow: they know stuff. If the market maker doesn’t adjust their prices in front of an informed trader, the market maker will go bankrupt. That’s market economics 101.
EDIT: People with pension funds, 401k's, IRA's, and the like are not trading day in and day out. They typically purchase funds which do the trading on their behalf. Most of these funds are controlled by institutions that aren't subject to be skimmed by the MM's as they are the MM's themselves.