Well, okay. Here's what I can say about the scriptural references. Isaiah is a very complex, metaphorical prophasy. I'm not exactly sure what the scripture is referring to, but it may have something to do with the suffering that will be found at the last days. I'm actually pretty sure that that is what it is refferring to. It talks a lot of Babylon, which is metaphorical for the sinful world. Babylon as a city was very defiant of God's way, always worshiped false gods and spread that worship to other nations. They were pretty much the opposite of what God wanted of His children. Therefore, when prophets refer to Babylon, it is usually in reference to the sinful world, since that city met its ruin. Isaiah may be profesying the destruciton of the sinful world, which will happen in a battle between God and the Devil, but that's just my interpretation.
The psamls quote is a sort of vengeful song by the captive jews. They are saying that, since they have been treated so badly in captivity, they would gladly kill their captors' children by dashing them to the ground. I admit, that's pretty violent, but that isn't God killing them.
The numbers quote: That
is an instance of God sending his chosen people against another nation. There a couple of things I would like to point out about that, though. God had promised to the tribe of Isreal that they would inhabit a certain land. I do not remember specifically who the Midianites were, but there are three things they could be: People who were inhabiting their promised land, People who wouldn't let the Isrealites pass to their promised land, or People who attacked them when they were already there. I'm sure, though, that it was not the latter, because they weren't in their promised land yet. So, whether it was the first or second is no matter. They were a tribe who was disobedient to God's commandments. They probably worshiped false God's and had no sort of law. Though this is not in the Bible, history would say that God raised some prophets amoung the Midianites to try to turn them from their evil ways. These prophets were probably disregarded, and the only recourse was punishment at the hands of a, yes loving, but also just God.
Now, for a little more information on why God would allow this kind of informaiton. Lucky for you, most of this is coming from Jehovah's Witness liturature, so you won't get too many Book of Mormon quotes
Humans are usually to blame for suffering, not God. They commit crimes, fight wars, pollute. Gal 6:7 "whatsoever a man soweth, that shall he also reap." Many of the sufferings are inflicted on Man because of Man.
Satan tempts people to be wicked
These afflictions were caused by Adam And Eve's first transgression. I still hold by my point, however, that this transgression was necessary and that this suffering is necessary, even though this JW liturature does not think that way.
Eclesiastes 9:11 says that chance plays a part in suffering.
But now we get to your question: Why would a loving god allow this to happen to his children, even if he doesn't do it himself? Once again, I say, so we can learn and progress. (Which point was that? I think it was B or C.) Another thing to consider is that this suffering won't be forever.
Another reason is that he is patient. He doesn't like to see man doing such horrid things to his brothers and sisters, but God is patient and lets it keep happening (once again I say that it is so we can learn and progress.)2 Peter 3:9 "The Lork is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but tah all should come to repentance." It shows great love that He would continue to allow sinners to live, so that perhaps they would come to the truth and repent of their ways.
These violent things can not be seen as punishment from God. Many un-Godly people don't suffer anything in this world, and Jesus was cruelly mistreated in his life time.
And for one last quote Alma 60:12-13 "Do ye suppose that, because so many of your brethren have been killed it is because of their wickedness? I say unto you, if ye have supposed this ye have supposed in vain; for I say unto yuou, there are many who have fallen by the sword; and behold it is to your condemnation; 13 for the Lord suffereth the righteous to be slain that his justice and judgment may come upon the wicked; therefore ye need not suppose that the righteous are lost because they are slain; but behold, they do enter into the rest of the Lord their God."
Most of the suffering isn't
caused by God, but it is
allowed by God for our own good because of his longsuffering love for us