No, nobody "HAS" to take a wide open 3 if they're not a jump shooter. I get that you want to take those in hopes of forcing the D to stay true but if you're not making those shots the D is going to back off anyway and you're wasting possessions.
Brimah's guy made a 3 in the first half; that didn't change the defensive scheme on him, nor should it have. KO and the team knew that that guy is not liable to make a lot of those shots and kept letting him take them. And lo and behold, he did take a few more, and I don't think he made another the rest of the game. Teams will gladly let TSam waste possessions as he misses those wide open looks until he starts making them consistently, which he has yet to accomplish.