Do you have a source for this? The only instances of arrests I can find are things like the above (illegal arrests) or people who trespassed on private property and were arrested for that. Meanwhile I can find plenty of stories of perfectly legal thousands-strong protests, which sounds like "mass protest" to me.

> I know the scope is different, but it is also good to keep in mind that bad things don't only happen in Russia.

Yes, but it depends on the purpose of placing that emphasis. "Even in a democracy we must be vigilant" is one thing. "We shouldn't condemn Russia for their human rights abuses because we're no different" is a very different message, and one that is manifestly false.

This is the hinge on which false equivalences turn. The scope is different, they shouldn't be compared, and being able to correctly grasp and differentiate different scales of moral offense shouldn't be interpreted as "I guess they don't know bad stuff happens elsewhere." Those comparisons do more to obfuscate than clarify.

> The biggest antiwar eruption in the U.S. took place in San Francisco, where protesters had vowed to shut down the city, and the police reported making more arrests than any time during the past two decades. The protests began during the morning rush hour, when activists used duct tape for purposes that Tom Ridge at the Office of Homeland Security would never recommend: blocking the intersection at Battery and Columbus, while handing out stickers that said "No War in My Name."

> During the morning rush hour, the city's Financial District was shut down by human blockades that stretched from the Embarcadero to Van Ness Avenue, stopping cars and bus traffic for hours and provoking a wave of arrests.

> By 4:30 p.m., several thousand protesters began sitting down at the busy intersection of Fifth and Market, where police began carting off dozens of them to a MUNI bus that had been commandeered as a paddy wagon.