They may be biblically informed, rhetorically polished, and intellectually responsible. They may love children, smile a good deal, and have, to all appearances, model home lives. They may be loved by the people of their congregations, often complementing them and expressing affection for them publicly. Indeed, all apparent gentleness, maturity, and love for biblical truth makes them more dangerous, for to have the appearance of one who loves the truth while tolerating the lie is far worse than openly announcing opposition to the true grace of God. In the case of the latter, it is possible to quickly identify where the person stands.
Tolerance is the border beyond which lies unacceptability.
It is the point at which something is viable in our thinking, and though we may not prefer what we tolerate, we nevertheless accept it and regard it as legitimate, preferences notwithstanding. I may prefer pizza and juice to water and dry rice, but at least water and rice are food and will keep me alive. They are indeed preferable to nothing at all, and I would eat them all the time if circumstances demanded it, but I would rather eat pizza than rice, and juice than water. So the water and rice are tolerable and, by comparison to nothing at all, are most necessary. I prefer tastier food, though.