How was Oberstein responsible for SPOILER'S death?

I mean Kircheis.

In the meeting of the admirals after Kircheis's death, they consider asking Oberstein for advice. One of the admirals rejects this and says that the cause of all this was Oberstein's uncalled for advice.

what does he mean by that? yes, oberstein tried to weaken the relationship between kircheis and Reinhard, but that had no consequences until that point. He would have died either way. So how did he cause "all this"?