Why should Bill Belichick take his starters out?

Why should he take his starters out of the game just because they are winning in a blowout? The only argument... ONLY ARGUMENT... I have read is that it risks hurting your starters and that Belichick doesn't care about his players. Welp... that doesn't make much sense to me. How is he risking hurting his players, namely Tom Brady, when they haven't been able to defend them all game? Brady comes out without a trickle of sweat on him and his jersey still clean... how is he gonna get hurt? Your risking hurting your players more when you are playing a close hard fought game... where the QB has been sacked like 8 times. You don't take them out until the game is through because your starters give you the best chance to win. Are you saying you should pull your starters then to prevent them from getting hurt... if you say yes then you have no IDEA what's going on. All the Patriots can do is get as much practice in for when they have close game... which will probably be against Indy this week.