"Can God be angry? The Scriptures say he can. For instance, Num. 25:4; 32:14; Deut. 21:20, and many other passages. The question is similar to another: ’Can God hear?‘ Or ’see?’ The Psalmist answers that query by propounding another: ’He that planted the ear, shall he not hear? He that formed the eye, shall he not see? He that chastiseth the heathen, shall he not correct?’ (Psalm 94:9, 10) May we not continue and ask: ’He that made his children sensitive to the injustice and sufferings of fellow beings, shall he be immovable, himself as a cold marble statue?’ That is unthinkable. The Scriptures speak not only of his wrath, but of his ’fierce wrath.’ However, they also give us to understand that,
’His anger endureth but a moment,
But his favor all our life:
There may be weeping in the evening,
But in the morning there is joy.’
-Psalm 30:6."
(Reynolds and Sjodahl, Commentary on the Book of Mormon, vol. 1, pp. 336-7)
During the destruction of Jerusalem ~ 70 AD, the Romans laid siege to the city, while the inhabitants languished with famine. Assured that the starving Jews would not be able to put up a fight, the Roman soldiers attacked the city.
“…when they went in numbers into the lanes of the city with their swords drawn, they slew those whom they overtook without and set fire to the houses whither the Jews were fled, and burnt every soul in them, and laid waste a great many of the rest; and when they were come to the houses to plunder them, they found in them entire families of dead men, and the upper rooms full of dead corpses, that is, of such as died by the famine; they then stood in a horror at this sight, and went out without touching any thing. But although they had this commiseration for such as were destroyed in that manner, yet had they not the same for those that were still alive, but they ran every one through whom they met with, and obstructed the very lanes with their dead bodies, and made the whole city run down with blood, to such a degree indeed that the fire of many of the houses was quenched with these men’s blood.” (Josephus, Wars of the Jews, Book VI, 8:5)