That statement is a complete load of rubbish. No professional aerospace worker, unionized or not would engage in intentionally poor workmanship in hopes of harming the company's management for previous decisions. You are simply spouting off without knowledge or understanding of federal contracting laws and the serious legal (civil and criminal) liabilities that would attach to anyone engaged in purposeful sabotage.
If he really felt the need to carry a weapon onto the aircraft, he simply could have applied to become a Federal Flight Deck Officer. If pilots wish to fly armed, then like everyone else they need to follow the law. Lots of commercial pilots are armed legally to provide an additional measure of security, but it has to be done professionally and lawfully. No one should be supportive of what this guy did, no more then anyone would be supportive of a passenger that feels the need for bringing a firearm onto an aircraft. Here's a link if anyone wants to become a FFDO...https://www.ffdoa.org