The explanation I heard and one that I always believed is that Garland was never going to indict Trump but Trump declaring he intended to run way way before the usual announcement date before an election forced Garland's hand. I think, in other words, and I heard this echoed on the news, that had he not gotten into the race Garland would have done nothing to indict him. I think Garland was and is a fool and a terrible choice for AG. It is also why it took forever to indict Trump. Garland, In my opinion, is almost as big a catastrophe for our democracy as Trump.