You know, Jesus calls Peter Satan in Matthew’s gospel, but we don’t really think that St. Peter is Satan, right?
You are taking Scripture out of context, Strawberry, and that’s the problem. Putting up two texts ‘side by side’ and looking at them out of context is the problem. They are from two different authors, two different books, and the ‘mindset’ of the authors differs. For the one author, he is going to be very particular in noting that “SATAN” incited David (because, of course, the Lord does not cause evil). This author is making it clear that God is only good, and that He does nothing evil. That is his main focus. For the other author, he is going to be very particular in noting that, even though the Lord does not cause evil, all actions, good or bad, exist because the Lord permits them. This is an author who is making sure that people do not see God and Satan as being two sides of a coin or yin/yang or with equal ‘powers’, one for good, one for evil’ --this is an author who is making it clear that God is the ultimate authority.
The two points of view do not contradict each other. It is perfectly possible to accept that God is totally good and does nothing evil, and also to accept that whatever evil exists/occurs in the world can do so only because God, being omnipotent, has permitted it. Because we know he is also totally good we trust that somehow there is a plan He has whereby somehow, evil will ultimately turn to good.