That has nothing to do with you coming to the conclusion of 'victim blaming'.
You:
Indeed, it is a big problem that the teacher was beheaded. But don't feign blissful ignorance, it wasn't just some random shit but rather caused by a specific act.
"If he didn't want to be killed he shouldn't have shown that picture".
I was replying directly to Loud Whispers, agreeing that it was a problem that he was beheaded but pointing out that there was a context here that LW was ignoring. It is a problem to trample all over peoples deeply held beliefs in a state school setting. Sure the reaction was totally over the top but it remains a bad judgement call on the part of the teacher. Just like if I walk into the darkest alley in the seediest part of town I don't deserve to be raped/mugged/murdered but it would still be a mistake to do so (barring other very good reasons for needing to do so.)
Nobody has said anything about enforcing heresy laws (other than you). The call is for the state not to favour or promulgate one religion over another in its own institutions.
You:
They did, in my opinion make a mistake but one that should have brought professional review/reprimand through their state employer and not a lynch mob.
"He should have been punished for showing a heretic picture in class".
The government should hold its teachers to account for doing stupid things in their professional roles. It is my personal opinion that a reprimand (which is hardly a 'punishment' in the strong sense of the word) would be in order according to what I know/knew about the circumstances, but a review which understood more may well have led to no action, which is why the backslash. This is not about 'heresy' but common sense and decency. I hardly suggested murdering him, or even firing him would be appropirate courses of action.
The call is for the state not to favour or promulgate one religion over another in its own institutions. It is a corrollary of a state religion not being taught in schools.
And how is not allowing him to show a heretic picture in school not favouring a religion?
Because there is no requirement to show it. It is not specific but similar to not allowing him to show pornography. Why must everything be allowed to be shown when it is known to be deeply offensive to some. As was suggested above there was no reason to show it since everybody in france already knew about it.