Melvyn...
I don't know if I can get a "good" list of 10 crimes and I am sure not all of them are in the 20th century, but I'll try.
1) Commercialization of the game of golf. Golf courses being used as a lure to jack up real estate prices...which maybe is okay...but when the best land doesn't go to the course, this leads to a less than ideal golf course.
2) Cart paths. Ugly. Invasive. Not neccesary.
3) Lengthening classic courses to combat technolgy. This ruins the architects intent and orignal design, neutralizes hazards, and makes the approach shot into the green of a different variety than intended.
4) Stimp meter fascination. How many great greens have been FUBAR'd because people want them to run fast? How many great greens could have been built if designers didnt' have to dumb down the slopes to accomodate 13+ stimps?
5) Ignorant Greens committees.
6) Over confident supers
7) Reckless renovations
These all have the potential to ruin great architecture.
8 ) Rakes. Bunkers are hazards. Not Zen Gardens that need to be manicured.
9) Over use of water hazards. Creeks are usually cool. Ponds get over done.
10) Trees. Cut'em down. We need some wind!!