Know what I think is the deadliest sin? G-R-E-E-D! It has destroyed friendships, families and nations. I don't think any of the ones that made it to the top ten list can come close to the destruction that "greed" can. It's a human thing, and one that seems to be a garnered tradition in most nations, today. I think in some degree we all have our moments when we give into it, but I think those of us, when we do succumb to greed, do it without hurting or stepping on the little people. It might perhaps be OK to walk by a blind beggar and not give him your last dime. But not OK to drop a quarter in his cup with one hand and take out a dollar with the other.
People just don't get it. We are here for EACH other, to be helpful to each other. Greed completely circumvents the humanity in us all, and so we become inhumane to our fellowman. Surely GREED should be an 11th commandment. Don't you think?