This has to make things a little awkward considering Samsung has been fabbing Apple's mobile chips.
It's only confusing if you think this lawsuit is meant to be won on merits and not to primarily annoy a competitor into not competing. It's placing pressure on Samsung to "toe the line" and "deliver our components, not your own products".
On the other hand, there is no chance that Samsung will shut down its phone division, whether or not Apple wins the lawsuit.
So I cannot understand how you got the impression that Apple is making this lawsuit in order to annoy Samsung into not competing. That is a much less likely explanation for the suit.