Sorry, but I just can't buy into the claim that it was "evil". I started doing typography (nroff, groff and TeX) on computers 30 years ago and to this date I still see nothing "evil", either with 2 spaces. 1 space, or 1-1/2 spaces (granted I distinctly dislike no space). Which I use depends on what the work is supposed to look like. I'm the kind of guy that literally goes over things with a magnifying glass, and might move parens up or down a point or two, commonly moves the dash in a telephone number up or down a point or two, and yes I use different spacing between sentences.
Which is to say that I am extremely critical about the form of work that I produce.
I could care less whether someone else uses two spaces or one after a period. It's a matter of personal style, there is no right or wrong as such. If the boss, or the specified style guide, says this or that, do it. Otherwise, take your pick. Who cares!
And note that almost all style guides will say that 1 space is more common, and 2 spaces is not wrong.
Thank you, Floyd. I was a typesetter for years both pre- and post the advent of the personal computer, and I could give a toss about two spaces or one space or whatever. Now can we get back to discussing important things like the D800E vs. MFDB....