The dangers of mob mentality are
well documenter and can be incredibly dangerous even when going against
people worth forming a mob to attack
How to create the mob mentality? Lets look
here. Apply the first paragraph to what Gabe's actions were - he consolidated flammable material, provided oxygen to burn and lit a spark - knowing full well what the consequences would be.
Or maybe you think this is justified because of some form of vigilantism? (if you have argued along the lines of "if we don't do this he wouldn't be stopped, then you are arguing for this) yet this is disproved thoroughly
here
Maybe you think internet abuse isn't really that bad? Well it's punishable by law
here(for dark reasons - internet defamation led to a young girls suicide)Or punishable universally in the US
here
Please people - do the required reading
It's in blue like this before making an argument, there is no adequate defence for this sort of action - and it is this form of righteous knee jerk reactionary crowd mindset that we must be wary of.