Umtitti's second yellow, well, CBs need to foul sometimes, or think they need to foul. I won't hang him for that one. But, his first yellow, for dissent,CBs cannot afford these types of yellows, especially early in the game. For this position, the chances of a second yellow are just too high. So, I do blame Umtitti, but not severely.
Lenglet, he had less than one second of felonious impulse. That might be human, given the physical nature of his profession. But, inexcusable, especially that early in a game. He is young, in a position where experience is quite valuable. I'm not giving up on him, but this was a very bad one. No felonies on the field for any Barca player, ever, please. Barca is not Mourinho's Real Madrid. Ramos does stuff like this, much to his discredit. The team should fine Lenglet.
Now, Vermaelen has to be readied to start vs. Tot. I'd like to see him start alongside Pique in at least one of the next two games, assuming he is in good playing shape.