Yes, we've learned that defense from Nazis and reactionary agitators is key to the success of any left-wing movement. That's why the Socialist Gun Club and John Brown Gun Society are gaining members.
It's sad that we have to protect ourselves, but as the poem goes;
First they came for the communists...
Because that's how it always goes. The favorite targets of the right wing reactionary; communists, LGBT+, the marginalized, and anyone else who doesn't quite fit into their capitalist hierarchies.
The capitalist must use violence to enforce those hierarchies, or else people will ignore them, because money is just something we all made up. It's not real.
Actual wealth is much deeper than money, it's time, it's effort, it's people's lives, and people don't want to slave away to make some other asshole richer, they want to live together in open communities where they can just live for themselves and raise a family.
Capitalists robbed us all of this, and communism is the push to get it back.