So, it was not a "quick slant into four guys"--which is pure silliness. One corner was picked, and all the other Patriots were on the line of scrimmage or the other side. The only person who had a play on the ball was Butler, and it took incredible instincts and skill to beat the Seattle receiver to the spot.
As to you point: sure, people wouldn't be up in arms. So what? Lots of people are up in arms about all sorts of things, but just because lots of people believe something to have been the right decision doesn't mean it is. That's just a basic fallacy. Additionally, calling plays worrying about how the media, or random people, are going to react is the definition of playing to lose. He made a bold call. It failed. He has to live with that. But I'd rather be him, making his call, than have been the coward that was Mike McCarthy.
Again, not what I would have run, but not as absurdly indefensible as you'd make it out to be.