My theory on the Glasgow School of art is that it was burnt down by some branch of the intelligence services.
In the 2 weeks running up the the June 2018 fire there was really strong press coverage that was pro-independence and pro-Sturgeon. Her narrative was acting as a counterpoint to Brexit and I reckon they torched the building to both shift the news cycle and also destroy an important piece of Scottish Heritage. Further more the first time it burnt down was May 2014, right in middle of indy ref debate.