Port Vale, people with your forgiving nature are a large part of why behaviour in society as a whole, not just safety critical environments, is in such decline. Companies must support staff that come to them with a problem, but there can never be a justification for behaviour like this. Blowing a slide because, for example, a crew are insistent on departing without deicing is extreme but perhaps a final act to prevent an accident if the pilots refused to listen, but walking away away after the event is clearly a tantrum and not making a stand over a safety issue.
Yes, the event should be studied to learn why it happened to avoid a repeat, but for Christ's sake, we need to bring back repercussions for being an arsehole. So many advocate not a blameless culture, but we're getting, in some quarters, a get away with anything culture.