Non-violent protesters who engage in civil disobedience, breaking the law by blocking vehicular traffic, streets or even congregating in protest without a permit and refuse to comply with a lawful order by law enforcement to disperse, should be arrested.
No more or less today than any other time, or any other groups, would similarly be arrested for illegally inhibiting law abiding citizens from going about their daily business driving, walking, etc.
There is a legal process to obtain a permit to protest by blocking public arenas. Doing so without authorization is illegal and would result in anarchy if any person or group could hijack the streets, at any time of their choosing. And the normal response to such law breaking, even if “merely” civil disobedience, has always been, and rightfully remains, to arrest those interfering with the public access without authorization.