If it were truly good to do these things, you ought to find them praiseworthy, glory in them, and joy to do them. I hope if you imagine yourself as one of those men you would instead feel sick to your stomach. If not, you're a sociopath.
If God chose he could have made a world where a rap on the knuckes felt good and was an act of kindness and we’d all go about giving each other uninvited cracks on the knuckles and calling it good.
In that case it would be good. As it is, no one wants to be disembowelled, so doing so because "God" told you to is evil.
God burned Sodom and Gommorrah with fire and brimstone, killing all but one family in the cities. This was an act of God. Moses led his people from slavery. This was an act of God. The Israelites settled in the promised land, defeating the Cannanites in war to do so. This was an act of God. You don’t understand my argument because you do not apply the premise of a sovereign God. So my syllogism is:
Obedience to God is good.
God commanded the Israelites to kill the Cannanites.
Therefore killing the Cannanites was good.
Your syllogism is:
Killing is bad.
The Israelites killed the Cannanites.
Therefore the Israelites were bad.
Your syllogism leaves out WHY the Israelites killed the Cannanites which is the whole matter of whether it was right or wrong.