I quoted it to show that David did other things and had other battles etc, rather than being accredited with killing tens of thousands, after killing only Goliath.
"As the troops were returning home ..... " - you seem to be assuming that that was the same day, or the day after, at least. Have you read
1 Samuel 17:52-53? David killed Goliath, the Israelites chased the Philistines, and scattered the dead bodies all along the road, then they plundered the camp. This, and
1 Sam 18:5, clearly implies there were several battles and victories for David.
I didn't comment on
Acts 1:6-8, and it is irrelevant.
The question of your thread is whether or not David was a good example for Christians. The short answer - which most people have said - is that Jesus is a way better example for Christians.
We can learn from David's story: he was chosen by God, called a man after God's own heart, sinned, big time - but repented and continued to believe in, and serve, God. But I wouldn't follow his example of lust, seduction and murder. He wasn't perfect; only Jesus has been that.
No, but King David was living around 3-4000 years ago. He lived in a time when they went to war on, and killed, their enemies; this was the only way of being rid of them.
Things might be a tad different now; don't you think?
Well obviously.
Again, what has that got to do with whether or not we can learn from King David's example or his story?