The defender was the negative focus of much of the post-match analysis after being directly at fault for at least two goals in the 7-1 loss on Tuesday.
"I don't think it's fair to separate a player from the team, because the team was really bad," Mourinho, Yahoo's Global Football Ambassador, said.
"David made mistakes? Yes he did. But, Dante made mistakes, Marcelo made mistakes, Fernandinho made mistakes. The team as a team made mistakes. So I don't think it's fair.
"I think everyone in my situation, everyone that is a player, everyone that is a coach, everyone that is not involved in the World Cup, but could be in that position. I think all of us are feeling really sorry for them."
Mourinho feels the record-breaking defeat will go down in history, much like that World Cup final loss to Uruguay in 1950, and sympathises with the squad.
He continued: "It is a historical moment. A moment that we will remember forever, the same way that we all know that once Brazil lost a World Cup final against Uruguay and the same way my son, who is 14 years old, knows that.
"In fifty years' time our kids will know that Brazil lost at home against Germany, one to seven. From my point of view, from the professional point of view, it's heart-breaking and I'm really sorry for them."
Jose Mourinho is an exclusive analyst for Yahoo’s worldwide football coverage, www.yahoo.co.uk/worldcup is the only place to read all his expert opinions during the FIFA World Cup 2014.