Why does G-d get Angry?

And, yet, there are certain tendencies which man is forbidden to follow in the middle-way, but must distance himself from extreme to extreme... So is anger an extremely evil tendency and it is proper for man to remove himself from it to the other extreme. One should teach himself not to get angry, even over a matter which befits anger.

(14) The LORD became angry with Moses, and He said, “There is your brother Aaron the Levite. He, I know, speaks readily. Even now he is setting out to meet you, and he will be happy to see you.

...If one desires to engender awe in his children and his household, or in the public, if he be at the head of a community, even if he desire to get angry at them so as to bring them back to the good way, he should only act angry in their presence so as to reprove them, but his disposition must remain calm within himself, even as a man imitates, who is angry when the time calls forth anger but in reality he is not angry. The sages of yore said: "He who yields to anger is as if he worshiped idolatry". They also said: "Whosoever yields to anger, if he be a wise man his wisdom leaves him, and if he be a prophet his prophecy leaves him." Verily the life of irritable persons is no life. They have, therefore, commanded to be afar from anger, so that one will train himself not to mind even the things which do cause irritation, for such is the good way. The conduct of the just is to take insults but not give insults, hear themselves flouted but make no reply, do their duty as a work of love, and bear affliction cheerfully. Concerning them the Verse says: "But may those that love Him be as the rising of the sun in his might" (Judg. 5.31).

The Gemara answers: It is only necessary to discuss this in a case where one does so to instill fear in the members of his household. It is like the incident where Rav Yehuda sought to display his anger and he pulled threads off his garment. Rav Aḥa bar Ya’akov smashed broken vessels, Rav Sheshet threw small fish on his maidservant’s head, and Rabbi Abba broke the lid of a jug. All of these Sages caused minimal damage in creating the impression that they were angry.

Undoubtedly, when Joseph’s master, appreciating that God was ever-present in his mind, did not believe what his wife was saying; for had he done so, he would have had to put him to death. However, he was still troubled by this episode, and accordingly put him in prison – had he not acted in this way, he would have become a laughing-stock, as his wife was (already) saying as much. By remaining silent, he would have provided her with a pretext for being unfaithful to him. This, then, is what Scripture intends to convey by the phrase, ‘And when his master heard the words of his wife’ (39:19): – for he was not unduly affected by the incident itself, since he lent it no credence; nor was he influenced by the robe found in her hand – as he undoubtedly questioned Joseph about it, and was told the truth. The Torah mentions this only briefly, as it is quite clear from the basic drift of the narrative. Hence it does not say (39:19): ‘And his fury was aroused against Joseph’, but simply, ‘his fury was aroused’. He was angered by what his wife had said, and his mind pre-occupied with what to do to appease her, given that she was insisting on her version of events. Accordingly, he resolved to incarcerate Joseph in the prison-house, which was under his control and located within the precincts of his own home, to remain there until (his wife’s) fury had subsided.

And he said: “Moses, Moses.” and he said: “Here am I” (Exod. 3:4). ...And He said: I am the God of thy father, the God of Abraham (ibid., v. 6). He appeared to him through the voice of his father, Amram, lest he become frightened...