My interpretation of verse 10 and verse 14 together is: don't waste time trying to persuade the leaders, but keep trying to reach their flock to try to teach them not to obey the false teachers.
" Let them alone, they are incorrigible, and blinded by their own interest against any conviction or instruction: as, Hosea 4:17, Ephraim is joined to idols; let him alone: so these men are joined to their superstitious traditions; I will not concern myself with them. They are pretended leaders of the blind, Romans 2:19, but themselves are blind. I pity the poor people, for while the blind lead the blind they both fall into a ditch. An ignorant and unfaithful ministry is the greatest plague God can send amongst a people. "Matthew Poole