How is Yahweh not immoral?

[957Chatterton]

Whenever a story of god's immorality surfaces, one of the following apologetic arguments is used as a retort:

1. That was the OT.
   
2. You just don't understand the customs of the day.
   
3. Who are you to judge god?
   

Let's look at the first one. What did Jesus really say?

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Matthew 5:17-20
17 “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. 18 For truly I tell you, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished. 19 Therefore anyone who sets aside one of the least of these commands and teaches others accordingly will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven. 20 For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven.

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He does not appear to have made any attempt to overturn them. Now, what if he did overturn them? This could only mean that god had made imperfect laws before.

A pretty weak straw man argument...

How is that a strawman?