It depends. Mistakes happen, sure, and you just say "it was a mistake, let's make sure we have the processes to catch it or avoid it next time and move on".
However, when there's one guy who always keeps making mistakes and creating work for the rest of the team, even making the same mistake multiple times, then, in my opinion, some blame is warranted.
However, when there's one guy who always keeps making mistakes and creating work for the rest of the team, even making the same mistake multiple times, then, in my opinion, some blame is warranted.