Moreover, Barcelona's performance this season has been less stable compared to Atletico, but now everything has changed and the additional 3 points have put Barcelona in second place in the standings. I think Atletico must know that all teams are the same and must try to win and not just focus too much on their local rivals like Real Madrid. The additional 3 points are important to maintain stability and also create a safe position in top competition. 
I thought Atletico Madrid could make things difficult for Barcelona, but I was wrong. In fact I think like you, because they concede the ball too easily and it looks weak like in your picture. It seems Madrid have to learn a lot from Barcelona so they can make Atletico like a docile cat. It seems that Jao Felix became Barcelona's differentiating actor, with his anger he worked hard to make Simeone feel guilty about letting go.
Even if we look at the red card received by Atletico Madrid, it happened at the end of the match, so there is no other reason why Atletico Madrid lost this match other than they didn't play optimally or they didn't lose in this match. Looking at the opportunities available, Atletico Madrid actually also had several opportunities, but the problem was that they were not very effective in taking advantage of the opportunities they got. On the other hand, Barcelona can take advantage of every opportunity they get into a goal and make them smile because they took home 3 points from this match. This result is good for them because they can return to second place in the standings.