Organising is great but guns are necessary against the other people with guns.

two things are necessary to be successful in a revolution . . . an idea in the head, and a bullet in the rifle! The force of action guided by the force of Anarchist thought.

Kropotkin

Under no pretext should arms and ammunition be surrendered; any attempt to disarm the workers must be frustrated, by force if necessary

Marx

The great means for the defence of the revolution remain as ever that of depriving the bourgeoisie of the economic means by which they rule, of arming everyone (until such time as they can be induced to toss their weapons aside as useless and dangerous toys) and of interesting the great mass of the population in victory.

Malatesta

Let every greasy, grimy tramp arm himself with a knife or a gun, and lay in wait on the steps of the palaces of the rich and stab or shoot the owners as they come out

Parsons

Por que no los dos?

The Black Panthers wouldn't have been nearly as effective without guns, and completely ineffective without organization.