In response to any worthwhile protest, the options are resist or acquiesce.
If ignore is an option, then the protest is ineffective and should be turned up. Which brings us back to the point of resistance or acquiescence.
So, to condemn the school administrators who are punishing the walk out protesters just to say they should have instead ignored them is silly. (Unless you’re against the point of the walk out. Then you indeed should encourage administrators to ignore the protests entirely. Or if you want to encourage the protests to intensify more quickly.) Of course the ideal and ultimate goal is acquiescence. So for their continual refusal to do something about a rather major problem, yes, condemn them. But refusal to engage, perhaps padded with some lip service to make some protesters feel like the mission is accomplished, is the opposite of the goal.