They're not really though. Had they played nice, they wouldn't be forced to rely on Sharp and could use Samsung's production facilities. Instead, they didn't play nice and this 2 billion bailout is a consequence.
Hardly. A single component supply is rarely the right choice if options are available. If there were ten options all producing identical and equally qualified displays, THAT would be a better options than two. It certainly helps nothing that Samsung is a direct competitor in the consumer space, and for the most part Sharp is not.
This would be like the US buying supplies from Russia during the cold war...
(Ironically, the U.S. did just that, but the Russians didn't know what it was for)