On the "1", on second down? With Marshawn Lynch on your team, and 2 timeouts, and 25 seconds? Of course they didn't know it would be intercepted, but there was absolutely no need to risk it. Interceptions happen all the time.
I thought the 49ers had the worst play-calling last year when they threw four times inside the 10 and failed to make the touchdown. I thought this was much worse because the ball was on the ONE.