That sounds all very nice and, above all, very convincing, Juan Toledo, but the fact of the matter is that your colleagues (and very likely yourself as well) abandoned your job today, illegally.
If I do that I get fired and that is the case for 99% of us who work for a boss. It sucks but that's life.
If your work has become so unsafe for passengers as you claim, then there are plenty of (international) organizations to denounce that. Have you done so? What have these organizations ruled about the issue?
If your work basically comes down to slavery, as you claim, then there are plenty of Spanish and European legal steps which you could have taken. Have you done so?
Even if you are right about all your claims, todays' event is totally disproportionate and irresponsible.