Part of fascism — consolidating power in general — is ensuring that your opponents have no peaceful option left to regain power. If they resort to violence, it’s an excuse to destroy them. If they don’t resort to violence, there are still many ways to craft a casus belli to justify the purge.
We on the left spent decades trying to warn people about the fascists, but people are so incredibly stupid and hateful that they cheerfully handed over all the power to those monsters. Now it’s too late and violence is inevitable.