Charles Spurgeon said, "Have you no wish for others to be saved? Then you're not saved yourself, be sure of that!"
The question should then be asked, "Is someone a Christian, if they simply allow the lost to perish without warning them?"
If they do not care for the will of the Father, "That none should perish", then, maybe they are not true Christians. In that case, it is not a matter of "Christians accommodating each other". It is more of a matter that there are weeds amongst the wheat. We unfortunately have to accommodate them and their lukewarm beliefs. It will be Jesus who separates us.
The greatest commandment is to love the Lord with all you heart, soul, mind and body. The second greatest commandment is to love your neighbour as you love yourself. So, how loving is it to leave people to die without warning them?