Cannot blame Burnett for not being perfect, every night. The pitchers allowed 2 runs; they did their job. The offense scored a run; they did not do their job.
The offense never does their job. That doesn't excuse whatever bullpen moves Davey makes.
He put Burnett in to face a battery of right handers and to turn Wieters around to his good side. Abandon the "setup man" thinking and put in a pitcher that makes sense for the situation.