The reason that you don't cut in line, is it because you respect all those people in line? You don't even know who they are. You don't cut in line because there is a rule in this society that everybody needs to follow. You just do whatever that you suppose to do. It has nothing to do with respect.
Cut in line creates drama and hostilities because you are taking something from someone else without permission. Example.
1. Excuse me. My I'm with my family is it ok for me to get in line with my family (most people will allow this)
2. Walk up to the line and just get in front of someone who has been waiting in line for 2 hours. Now you have taken something from someone who has stood in line for 2 hours to get it.
#1 isn't so bad because there's a willingness to help someone with a family. I was at Disney World where my family was ahead of me. The people who were near my family saw that we were family and told me I could get in line with my family, I didn't ask to cut in line. They just understood on their own and offered. This was helpful to me, so I said thank you. The amazing thing is that in reality I cut in front of 15 people, and no one became upset because of it.
#2 is basically this. "Why should someone take from me for free, what I had to work for / sacrifice for?
For the most part, I would guess ti's not so much what you do but how you do it. Aborbing saddness is only bad when you don't help. A child who is lost may be sad, But helping that child helps to remove that sadness. Not helping the child could bring a lifetime of sadness and regret, if that child dies because you didn't want saddness. Now you have brought sadness in the world.
It's not that you "don't care" it's just that you haven't learned how to deal with sadness, so you avoid it. Sometimes running away from the things that are hard for us gives us more of that thing that is hard for us.
People who often complain about things are the same people who aren't doing anything to fix it.