Summary: Praise the Lord!
Response: No, seriously, that's it. No smiting, no persecution, no history. We put it all aside because, whether because of or in spite of all of that, God is worthy of our praise.
Summary: The psalmist focuses on the Israelites and their relationship with God. He saves them and provides for them, so they should give Him praise.
Response: Again, my mind pushes me towards a "pay it forward" mentality. God's done amazing things for me, too, and my actions should reflect that by giving to those around me.
Summary: The psalmist [David] is determined to praise God as long as he lives. God is worthy of that praise, helping the least among us.
Response: Caution: I may be extrapolating a bit here.
A lot of times, I wonder how we can stray so far from "help people" as a main tenet of faith. I wonder if the logic goes that God says, "be holy for I am holy" and takes that to mean we should exclude ourselves from "undesirable" people. When, in this psalm, we see God helping especially those people, as if to say (to me anyway), this is what holy looks like lived out. And that's quite the challenge for me!
[EDIT: that ain't David yo]
Summary: David goes all in on praising God, promising to do so continually. From what He is to what He does for those He loves, for His mercy and authority, He is worthy of praise.
Response: God, You are all this and more. Help me to keep finding new ways to praise You!
Summary: David wants God's protection so that he and his people can thrive in God's blessing. (Oh, and he wants God to kill and destroy everything and everyone else.)
Response: Just... trying to leave it alone. Six more after this. And I mean yes, the bad guys have it coming. They've known nothing other than hatred of God. But if we hate them back, it doesn't show the love of God. I believe God loves everyone. Even those who haven't heard of Him. Even those who profess a different faith. Even those who question or shun or hate those who have faith. He loves them, so we need to love them, too.