Yes, we sometimes stumble when we least expect it. It is encouraging to be reminded that repentance is such a powerful witness.

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Points to Jesus in that man, (DAVID) is willing to kill for to justify or pardon man's own acts of sin ,

25:16 I heard a Muslim argue once that these bad points were made up or invented as slander to the Jewish Patriarchs/Kings.

I think you're reading David's actions in a poor light. I think the text is showing us that he's so humble that he will accept help from anybody. He won't scoff at the idea of Phillistines protecting him. I could be wrong of course but there doesn't seem to be anything negative about what he did. Except for the losing faith in God part. He was very afraid that his luck would run out so he doubted God. But that doesn't mean trusting humans is bad. Edit: Oh, I completely missed the part where he murdered his own people. 😮😯 I read the entirety of 1 Samuel once but I didn't notice that he actually did that. I definitely don't remember that part of the story.