The Crimes of David

Time has changed David a lot. I remember when he first appeared as the youngest of Jesse's sons. He was so young and so devoted to God he intended to kill Goliath with a simple stone. As soon as he started becoming older, his morals began changing. They didn't seem much at first. He sacked the house of one of his wives husband, but that didn't seem to have a negative impact on his image. He still was very devoted to God and respected him so much. For example, he didn't kill Saul because he was "one of God's anointed." (Samuel I 26:23). And then he became king.
Greediness and ambition can really twist a person's morals. When he finally gets to be king, he starts spreading his territory rapidly. In doing so, he kills thousands of innocent people, and sacks city after city. He even turned the lame and the blind into his personal enemies. Why would he do that? He literally said so, "the lame and the blind, that are hated of David’s soul," (Samuel II 5:8). Isn't a king supposed to have mercy on the week and the less fortunate? He conquered city after city mercilessly. Like he did with Metheg-ammah city:
"David took Metheg-ammah out of the hand of the Philistines. And he smote Moab, and measured them with a line, casting them down to the ground; even with two lines measured he to put to death, and with one full line to keep alive. And so the Moabites became David’s servants, and brought gifts." (Samuel II 8:1-2).
During this time, merciless conquering isn't so bad. It's actually part of forming nations, and nobody takes it so seriously. Some think it's even justifiable. What David did that really messed everything up was commit adultery against Uriah. He lay with his wife Bathsheba, and she became pregnant. What's worse is that he then tries (and succeeds) to kill Uriah. David marries Bathsheba, and she has his son. It's so unfair that David, a king who has all the riches in the world and a lot of wives, can take the only precious thing Uriah had, which was his beloved wife. Like Nathan's metaphor said:
"There were two men in one city; the one rich, and the other poor. The rich man had exceeding many flocks and herds: But the poor man had nothing, save one little ewe lamb, which he had bought and nourished up: and it grew up together with him, and with his children; it did eat of his own meat, and drank of his own cup, and lay in his bosom, and was unto him as a daughter." (Samuel II 12.1-4).
It's actually fair that God gives him all that punishment for his crimes. Apart from making his kingdom full of turmoil, he killed his son. David deserved it for being such a greedy and ambitious pig. So much power went into his head and finished all the morals he had. Most men in power tend to loose their morals.