A red card in the game between Chelsea Aston villa was very much avoidable but it was sad Chelsea got the card regardless, I don't know if to blame it on the player or anyone but one thing I think for sure was that it was very unnecessary at that point, there are other big team they will get a red card against and I will see it as worth it to an extent but not for a team like Aston villa.
The red card issue actually destabilized the entire game plan for Chelsea, from the replay of that tackle, and if it were to be some referee they might have considered that tackle as not a red card offense but should have been decided as a yellow card offense rather, the tackle in my opinion was not that intentional as they offender went for the ball first before matching on the opponents leg. Anyways, performance was bad and Chelsea did have ample opportunity to have gotten a goal but they couldn't utilize any.
That is why they have VR mechine nowadays to determine and give a clear results of situations like this, the referee may see it as an intentional tackle from his angle. Besides any tackle to stop an opponent is intentional but what matters is your approach not to cause injury to the player involved.
Chelsea is a big club but don't expect the outcome to always be in their favour, the game can go either ways.