That was the most evil thing he attempted throughout the entire game and he failed at it. The only other worthwhile "villainous deeds" Sephiroth commited were killing Aeris, President Shinra and Tseng, setting Nibelheim ablaze (not even realy destroying it, just setting it on fire) manipulating Cloud and freeing the WEAPONS. That was about all he actually did. He just wasn't terribly "evil" in my opinion. He let Rufus act more like a heartless villain than him. That's pretty lame.