As I said before, the system invites the mistakes and has done for a long time. We take the lead and instead of going for the jugular we always sit back and let the pressure build. This will always lead to mistakes when we have such a shockingly poor defensive unit, which again is set up by the manager.
The players can take responsibility for the errors they committed sure, but the reasons they happen 2 or 3 times a game is down to the manager and he can't keep using it is an excuse.