Before computers, Wall St. was still largely about trading and standing between people who have money and people are willing to trade ownership for money. That's it.
The problem is that HFT is about profiting on even the smallest trades, but cranking up the volume to 11. It's kind of like what Wal-Mart did to retail, they make less money per item, but they literally make it up in volume.
Algorithmic trading can be slow or fast, but it plays off the fact that machines can compute the data and make a decision faster than humans can, especially on a digital marketplace.
It is unfair to human traders, sure. But, you have a digital trading platform, so at some point it's impossible to stop algorithmic trading.
If you want a market where the purpose is to create capital for businesses without dealing with machine trading, you need to start a new market that is not run by machines and is only operated by human, person to person trades.