Answer:
Crassus's actions were unethical because he asked for payment first and withheld his help in putting out the fire until he received payment.
Explanation:
Marcus Licinius Crassus was a wealthy Roman who made his fortune from the buying of properties from those proscribed by the Sulla. This was done in such a way that, all the properties of the enemies are auctioned off at the cheapest price available.
Also, because of incessant fire outbreaks in Rome, Crassus established a 500 strong fire brigade men who helps in furthering his quest for richness. If a house is burning, those men will rush to the house but would do nothing till Crassus arrives.
He will offer the house owner to but the house at a ridiculous price. If the person accepts, the fire would be put out but if the person rejects, he will allow the whole house to burn to ground.