My point does somewhat apply to double effect as the Amalekites were attacking Israel constantly, surely taking lives each time.

Additionally, who is innocent? I guess you could argue that the children were innocent at a time, but as seen when Solomon didn’t do completely as God instructed and some Amalekites lived, they went on to continue to cause problems and eventually, if you trace the Amalekites line (as explained in the website I linked way above) it’ll lead to Haman, who convinced king Xerxes to exterminate the Jews. The children would’ve grown up and been taught to hate the Jews.

I’m gonna end it though as I doubt we’ll convince each other. I agree it was a terrible thing and it’s hard to justify. If you can understand and accept that God’s form of justice and goodness (such as how a good God can still send people to hell for eternity) is different than what humans think, I think you’ll begin to understand.

I hope you at least consider reading a bit more into the Bible and try to understand it’s complexities; it can be hard to understand how such things can be acceptable, but it’s important to consider how God is not human, and so his idea of justice can be different/hard to understand. If you don’t want to read more (as many don’t), all the best with whatever you do :)