Why do I smirk when I tell people bad news?

Might be a dumb question, but here goes. I did it the other day, explaining why a co worker could not come into work was because her husband's brother passed. I found myself to be smirking almost. I don't know why I did, or do sometimes, but I think to myself that maybe something's wrong with me.
Why do I smirk when I tell people bad news?
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