There's video showing the ship apparently suffering some sort of electrical/engineering casualty before hitting the bridge.
I'm emphatically NOT endorsing the conclusions this guy is jumping to, mind you. It's far too early to be making any such judgements.
I don't know enough about the currents in the harbor or the other details, although from what they're saying the ship was leaving port, on a night with calm wind and (from all the footage of the collision) clear conditions.
That said, this means a major highway will be shut down for years until a replacement bridge can be built and operations at the Port of Baltimore will be snarled for months. Not to mention however many people just got killed (seven people missing, at last report).
Edited to include: Just watched the video of Baltimore's diversity-hire mayor, wearing what looks like some sort of high school letter jacket, babbling about how this disaster looks like something out of an action movie. Let's just say he is clearly out of his depth and leave it at that.