If ignorance was the exception to a staying out of hell then we would do better for the lost by never sharing the gospel or spending millions of dollars trying to reach unreached territories with the message of Christ. Their ignorance has already saved them.
Not going to get in a semantical discussion over the use of the words about fear in those two passages. If a person wants to take a chance with their eternal salvation by trying to find loopholes in God's Word, no argument I might be able to offer, if I wanted to offer one, would convince you otherwise. For me, I simply have decided that eternity is too long to be taking chances.