That's it in a nutshell. Tomalak was an opportunist constantly looking for any opportunity to get himself into a better position regardless of who he had to step on to get there. You could see that in TNGs "The Defector" that he was really a coward in wolfs clothing. Too bad for him that his shenanigans got the better of him in the end. I suppose too bad for us as well. I certainly enjoyed encountering his antics from time to time.