Why do you think it should be legal to sabotage your employer's systems in response to a labor dispute?
It isn't? In many parts of the US a car is needed to hold a job, or to even get to the grocery store (which might be miles away). Moreover, grocery stores do provide the means to "feed your family". Does that mean looting/vandalizing them is fair game after failing to "negotiate" with them?
If you have somehow gotten yourself into a position where you are supporting a family based on knowing how to do one thing that you can only do for one company, sorry but you either massive screwed up your life (unlikely) or you are afraid to step outside your comfort zone and work elsewhere (likely).