To be polite and clear would mean forsaking one's divine reward. Only attacking will preserve the divine obnoxiousness which will assure salvation.
I think a critical aspect of this is that actually persuading people doesn't matter. So if it turns out that most people turn away from language that is clearly offensive and inaccurate, there's no need to reconsider methods and techniques. Rejection is confirmation -- their version of rejoicing that by provoking rejection they are counted worthy to suffer for the name.
It sort of does away with simplicity of heart, doesn’t it? and makes everything into some sort of desperate game or even becoming some sort of self-anointed heralds or prophets.
It could even become—unwittingly-—a different form of idolatry, without the “graven image”, but one that is somewhere in the depths of the psyche.
We often forget certain passages in the Sacred Scriptures that are full of meaning for us; for example, when Jesus asked that Nathaniel come to Him. He knew something about Nathaniel—something that was good that no one else but God knew. And Jesus said of Nathaniel, “He is a true Israelite; he is a man without guile.”