I think Lewandowski's first yellow was not necessary - no reason for him to tactically intervene like that. The second was a result of an aerial ball skirmish - yellow was overdone.
FYI: it was his only 2nd red in his career.
The first one was somewhen in 2011/2012 in BVB vs Hamburger SV when he was sent off with a straight red for too clumsy an attempt to intercept the ball. Mind you, BVB lost that home game 1:3 or 1:4 even.
It is a prerequisite to have winners mentality when the win comes in a situation like that and it should be a relief to see that the touted reliance on Lewandowski's scoring was overblown.
Lewandowski at 34 should have known better though. As much as I am declared an admirer of his, I am disappointed with the level of his lack of judgment. Especially, the foul that produced the first yellow so early in the game is too difficult to justify.
It is all too funny how all the Lewandowski's talent doubters react.
They sit all quiet in their gopher holes when he superbly performs, delivering Barca goals and assists and deserves all the splendor of the won games, and then, when he misses a panelty or is sent off with the red - which is nothing else but freakishly isolated instance of his individual lack of judgment - they all are all over him, instead of rejoicing the victory. The victory not only in the aspect of getting 3 points and favorable result while playing outnumbered but, equally important, the internal team victory about bailing out Lewandowski's screw up after his bailing the whole team out in previous games which, had it been not for Lewandowski, would have been drawn.
What laughable and rubbish accusations about his play at Barca to be intended for winning his own accolades. The number of assists, assists that should have been goal converted and brilliant build up play is so much consistent with his performance in Bayern games... Still, don't forget,he is a striker, a beast hungry for goals, some degree of selfishness at the such close moments are to be expected, if not required.
Lewandowski will be all right. From my long term observation of his career, I can assure you that after the World cup, he will return with even more vigor and motivation.
Enjoy having him, while he still lasts.