This is a big fat
nope for me.
Some people aren't going to behave better just because you asked them to or explained why people downvoted their comment. Especially coming from a random internet stranger, this is usually experienced as an attack, not an attempt to be helpful.
And it's often not actually meant to be genuinely helpful. It often is fairly ugly behavior where someone feels like they can dictate to you how you are allowed to participate.
This means demographic outliers, minority views of any sort (in the sense of "a view not held by most people here") and anyone who has ever been picked on can be bullied, told to get in line and it's your fault you are being attacked.
That's not a path forward towards a better discussion forum.
As things stand currently, if you are willing to soak up the downvotes and you, yourself, follow the rules and are respectful, you can speak your mind and take a stand on unpopular positions, etc.
This is a forum that values rigorous scientific discussion. When social crap becomes more important than being able to state the truth as you understand it and have some hope of meaningful discussion, then HN is dead.
Hurt feelings about downvotes is social crap.
The culture supports the practice of corrective upvotes. That is sufficient to ameliorate most bad downvotes.
We don't need to actively encourage negative engagement, bullying and an attitude that you are required to get with the program and march to the same tune as everyone else lest a single downvotes lead to a pile on of ridiculous and pointless drama.