He caught it for one reason - he said it himself - he's always looking to "make a play." In other words, he caught it to cover himself in glory. His urge to do so comes from a good place I'm sure, McCree wants to succeed just like every other NFL player. Unfortunately, and I feel badly for the dude, his aim is slightly misguided. Success is winning, plain and simple, the Patriots know this and the vast majority of the time in critical situations they react accordingly.
Leading by 8 with 6 minutes and change left, the 'play' to make is gaining possession. If he had swatted the ball to the ground he would have made a great 'play' that would have likely won the game. But a winning play wasn't enough. The team's success wasn't enough. McCree wanted to show his talent, putting himself before the team and, ultimately, the 'play' before the win.
McCree's exact words -"I was trying to make a play, and anytime I get the ball, I am going to try and score," McCree said.
A awful lot if I's in there, eh?