Yeah, we do care about our posts. We do not take it lightly when we receive a downvote. We try to make the post better.
In the best case we have an explanation in a comment to help us what could be done. In the second best case we see for ourselves what we did wrong. In both cases we will not hestitate to improve our post with an edit, well knowing that ever so often a downvote will never be reverted. But still, we care for it, we do this for everybody else who may read this later.
But sometimes it just happens. A downvote comes in which was not explained, is inexplicable or even unjustified. Nothing we can do about this, really. The more we had contributed, the more we all will be faced with this unexplained downvote. Inevitably.
This of course means quite a burden to us all. Instead of reading quesitons and providing another good answer we unnecessarily spend time on figuring out what went wrong. It itches. It's a waste of ressources.
To avoid this I made myself a little checkbox that considerably helps me to understand a weird vote, and it also helps me to stop thinking about it:
Unexplained downvote reason
Pick one to feel better☐ did not know the difference between up and down
☐ wanted to accept but slipped
☐ so urgently needed to improve my personal downvote rate
☐ had no time to understand your answer
☐ answer too long
☐ answer too short
☐ expected an even better answer than that
☐ Meh, just 4 teh lulz