Do you question whether adultery is a sin?
Adultery is a sin because God says not to do it. I've shown many examples of God saying not to fear. Can you show me where adultery or fear are encouraged?
The difference between the two is that one is in a list of Commandments directly stated and even put into stone by God himself and the other is not. The other is your particular interpretation of context-less quotations. I can do that too with these quotations that show that fear is something that we
should do, indeed, that we are directly told to do:
"The fear of the LORD is the beginning of knowledge;
fools despise wisdom and instruction" (Proverbs 1:7).
“And do not fear those who kill the body but cannot kill the soul. Rather
fear him who can destroy both soul and body in hell” (Matthew 10:28).
"The fear of you and the dread of you shall be upon every beast of the earth and upon every bird of the heavens, upon everything that creeps on the ground and all the fish of the sea. Into your hand they are delivered" (Genesis 9:2).
These are all about fear of God, of course; nonetheless, they are about fear being something we
should have. Your argument doesn't say that fear of God is excluded in this, just that fear is a sin and that nowhere in the bible does it say that fear is good. I am directly refuting that without resorting to specious argument or editorializing.
This semantic argument about "common sense" is also ignoring that a good deal of common sense is based on fear. Fear of discomfort, fear of confrontation, fear of death, fear of losing a child, fear of being found out... We all make judgments based on those little fears and call it "common sense," but make no mistake, the root emotion is fear for a large portion of what we term "common sense."