If what you offer is not understood, that does not mean the person reading is not attempting to understand you, and in a debate the obligation to be understood is mainly with the writer, not the reader. Also argument is a prerequisite of debate, it is in the definition.
I will never understand why people fear polemic.
It's true, sometimes a person is debating and sincere, but that is rare. Very few are debating to reach a conclusion but just trying to score points and argue for the sake of argument.
The fact humans are insincere to truth is not because it's natural to be, but because the infection from Iblis in that regard has passed generation to generation, and has not gone away.
If a person is blind and comes to argue, you do as the Prophet (s) did, turn away from him, as it's not upon the Prophet to purify such an arrogant soul and of course would never turn away from someone striving for the truth.
We maybe wrong sometimes, but, usually, you can tell if a person sincerely is seeking to know or just wants to debate.
Those who lead astray are the problem, not those who guide to the truth.
Sometimes a person can make better effort and make it easier to facilitate truth that people understand the reality which is hard to put in words, but it's mostly the fault of listeners who haven't realized the truth, since they are ever playful, don't care about their fate in the next, deny the truth on conjecture, and are taking risks without fear of consequences of their ways.
Whatever effort a person makes to cure those with a disease in their hearts and make them hear the wisdom is an act of generous compassion, wanting to guide them out of their error so that they maybe spared the hell-fire.
The grief of those who care about others fate and those with knowledge, is intense grief, as expressed in Quran "so it maybe that you kill yourself out of grief for them that they will not believe in this narration ever"