First we have “the problem is downvoting without a reply” (which for the record is the argument of a Sea Lion. Downvote and move on is perfectly acceptable)

Then we have “the problem is seeing downvotes and replying” which… Didn’t you just ask for replys when downvotes?

Finally we have “if asked I may or may not explain why I downvoted” which again is contrary to your initial issue of “people downvoting without giving a reason why” as you apparently are doing that exact thing and you might give a reason why if asked.