Crashing into Webber in Japan was fully his fault, regardless of who they tried to lay the blame on. He also tried to blame Baku 17 on Hamilton. Blamed Webber in Turkey 10, Tried to blame Verstappen in Singapore 17, Tried to blame Hamilton in Monza 18. See a pattern? It's never his fault.
Even if Vettel was previously error-prone; he has never been as error prone as he has been these last few years with Ferrari
He's been in more traffic with Ferrari because he didn't have by far the fastest car like he did in RBR, more traffic means more opportunities for mistakes.
Ferrari are not the problem, as evidenced by LEC'S great first season with them. Vettel is the problem.