Now that's an interesting point because, once again, it speaks to the distance between Gale's words and his actions. He repeatedly declares his love for Mystra but what he is doing is heretical to Mystran belief. Mystran faithful, especially the chosen and the magister are expected to author new spells and to create more artifacts. A good Mystran wants to increase the amount of magic in the world. Gale is doing just the opposite - he destroys artifacts. In his words he worships Mystra but in his deeds he worships Shar. Gale is either on the edge of a conversion or someone who worships Shar but doesn't realize it - he's another candidate for chosen of Shar
Interesting take. OTH it's perfectly believable that it is just bad writing by Larian to have Gale doing the opposite of what a good Mystran would do.