1. You're a relentlessly polite and caring person. 2. LJ has comment notification tissues at regular intervals.

While I am 100% all for polite and think you're awesome for being so considerate of other people's feelings, my personal take on it is that A) most people realize point the first and point the second, B) people who get bent over not getting a response to a "liked this!" need some actualfax problems to worry about.