The thinking is that it must either be 100% because of blasphemy 0% because of blasphemy.

It's what you get when you turn up the contrast to 100% on a picture of a person. Hard to make out much except extremes. It's not a picture of the person. It's a mindless algorithm.

Most cases at their origins are petty, spiteful, manipulative. Often fictive. That's what they were in SE Europe in the Middle Ages when Xians were 1/2 of a Muslim in a law case. Or in pogroms.

But most of the people demanding punishment view the charges as valid most of the time.

Notice the absence of binary thinking there: Most, most, most. Now "most of the cases", but not all, are selfish. Now "most of the people" are devout and not selfish (in a materialistic sense). Now "most" refers to time.

Making it worse is the idea that even those who do appear to be pursuing such cases for materialistic, selfish motives still think they're doing it for good reasons. The "bad guys" are bad, and the rationales are self-serving. For all that, we delude ourselves fairly often (most of the time, in fact), in assuring ourselves that while some act, some law, some movement, may serve our narrow, material self-interests, in fact there's a large principle at stake that really makes any attempt at saying we're greedy and selfish, unprincipled and self-seeking, mere cynicism.

That happens both right and left, secular and religious, young and old.

One man's blasphemy is another's truth; one man's lack of correct politics and political views is another's truth. When you see ideological correctness touted, adherence to a specific, narrow definition or focus, you're looking at what in religious terms is called avoidance of "heresy" or blasphemy. BTW, the Greek word for "heresy" means ...

wait for it ...

"party."

Not "let's get together and carouse" party, but "let's follow a person or form a group based on some idea" party. As in "political party." Or religious "party" or sect.