There are tests used in philosophy and court that can be used as a guideline:
1) Impact verses intent
2) What if everyone did it.
A word of warning! Picasa did much the same back in Dec. and it was a disaster for a lot of folks. It scrambled their Picasa databases beyond repair and would continue in a loop that kept updating files and changing them. It did it to mine.
Yinhi: Um... I don't know ifyou've noticed but your horizon is crooked... you may wantto fix that...
do I do a delete first?