Likely because there is no practical way to identify those relative few who "really mean it" [...]
Which is why I don't see any practical benefit to attempting to put people into buckets on how "really" they mean it - its not actionable, nor is it measurable.
If 48% of people say they want us dead for our speech, barring other irregularities in the polling, the practical approach is to simply take them at their word. If only a small portion of that 48% are true believers, but the remaining portion are more than willing to follow their orders, there is no practical difference.
I agree. I don't see any practical benefit to trying to divine which people "really mean it" and which ones don't, either - which is why I don't recommend that anyone waste their time trying. In fact, my point is that there is no need to do so. Among those who might "really mean it", the only ones who really matter are the ones who actually did (or are doing) something about it. That is the bud that must be nipped, or the root that must be struck. The "48 percent of college undergrads" from the OP are ancillary.
[...] nor is there any practical way to identify who is [going to] "do something about it".
This is true - but I haven't been talking about trying to identify who is
going to do something. I have been talking about those who actually
did do [or are oing] something. Those are the people who matter, and they
can be identified (by virtue of the fact that they did or are doing something)
[1]. They are the ones who compose "that group of relatively few people in the overlap" that I referred to in my previous post. Absent that group, there won't be any order-followers (whether "true believers" or just opportunistic go-along-ers), because there won't be any order-givers.
If they ever even do anything at all, most of the people who agree with statements like the one in the OP (because they approve the use of deadly force in the name of thought-policing and speech-controlling) won't do anything about it unless and until some relatively much smaller group of people actually act to implements such a regime.
[2] It is the latter group that should be the locus of attention and reaction/counter-action, not the former (who are mostly just "useful idiots" and assorted hangers-on). Once they've established and entrenched their regime, it's too late. The upshot of all this in the context of the OP is that it isn't the student respondents who are the real danger (any more than were typical German citizens - including the ones who enthusiastically "sieg heil"-ed when Der Führer's motorcade drove by) - it's the (relatively fewer) politicians, bureaucrats, administrators, and their enforcers who actually enact what those (relatively greater) student respondents merely (have been indoctrinated to) endorse.
[1] The crime and tragedy of the Holocaust was exacerbated by the fact that so many did not take sufficiently seriously what the Nazis were actually doing until it was too late, and so could not react/counter-act in a timely manner with sufficient numbers. If there ever comes a time when a state-enforced "death penalty" (or other severe punishment) for "offensive speech" is implemented here, it will probably occur under the same dynamic.
[2] And even then, many of them still won't do much of anything significant beyond merely agreeing with or endorsing the regime.