Users trying to kill kernel_task sounds like an uncaught design problem. Replace the kill options in context drop-downs with "Why can't I kill kernel_task?" and have it pop open a short explanation, do the same as a feedback message if anyone tries to kill in the terminal.
If the system doesn't do that already, either nobody considered that users would try that particular nonsensical thing, or nobody cared enough to let users find out immediately instead of wasting their time thinking the computer was at fault.
If the system doesn't do that already, either nobody considered that users would try that particular nonsensical thing, or nobody cared enough to let users find out immediately instead of wasting their time thinking the computer was at fault.