People like to complain about algo trading and HFT without suggesting how they'd improve it.
Technology and money! Scary!
It is an open market. People use computers to participate now. There are very tricky engineering and social problems involved, but I really don't see anyone suggesting a better way to do things. If a bank needs to exchange dollars for Euros, what should they do? Call someone on the phone because they're afraid of competing in an electronic market?