I still sometimes journal then throw the entry away or tear it up first. I used to think that was strange and knew I shouldn't but couldnt keep what I wrote. I later found out that this is actually a therapy technique. (knock me over with a feather! lol) The therapy activity concept is to "release" the experience out of your head into tangible form then distroy it which allows the person to leave their troubles behind in a sense. I wouldn't be surprised to find out your erasing was in fact a therapy. so if it makes you feel better go for it. .