“When I say to the wicked, ‘You will certainly die,’ and you do not warn him – you do not speak out to warn the wicked to turn from his wicked deed and wicked lifestyle so that he may live – that wicked person will die for his iniquity, but I will hold you accountable for his death.”
God informed the prophet of his responsibility. The wicked must be warned. Failure to warn would bring guilt upon the prophet.
Love is the great motivator for evangelism, but it is always aware of the weight of accountability before God for lost souls.