[AndrewC]

They cure bacterial disease, and when abused, do indeed select for more virulent bacteria.

I think you might mean more resistant bacteria.

In a further observation, it appears that your judgement should also apply to the 1997 Darwin day lecturer, Dr. Douglas J. Futuyma, as in his speech he stated ---We have observed many pathogens, such are those that cause malaria and AIDS, evolve resistance to antibiotic drugs, and by understanding this process, evolutionary biologists can help to design ways to retard such evolutionary changes

[derek141]

You are correct about the resistance; I was thinking in terms of what the original post reflected, i.e. bad bacteria vs. worse bacteria... and resistant bacteria are definitely worse. I am unfamiliar with Futuyma.