If you believe that, you've no idea how LVG works. Herrera earned his place & took his chances. Van Gaal does not listen to the fans, he's very much his own man & believes his philosophy is the correct method.
Herrera had already earned his place before he got dropped without justification.
Louis has succumbed to fan pressure already by abandoning the woeful 352, reinstating Herrera and dropping Falcao. It's possible that he would have done all these things without fan pressure, but he took these actions soon after the fans made their views known.
Louis is under tremendous pressure to produce a top four finish. Had he persevered with the 352, benching Herrera and playing Falcao and capped things off by falling out of the top four everyone here as well as Louis knows he wouldn't have survived to see next season. As it stands now, by abandoning the 352, reinstating Herrera (whose only crime was breaking his rib) and dropping Falcao he's shown a willingness -- at least to some degree -- to listen to the fans. Even if we drop down to fifth he may have bought himself just enough faith from the fans by not being stubborn fool he was at risk of being.
Yes, Louis does believe in himself. But Louis is fully aware that football is ultimately a business and that customers cannot be ignored. Had we been cruising along atop the table he could do whatever he wanted, but being at risk of becoming the next Moyes he had to listen to the fans. That doesn't be necessarily mean he'll ever play Rafael again, but there's no question he heard the fans loud and clear on his tactics and choice of certain key players.