First of all, most people in Europe have been disarmed. Secondly, we are all aware that American police, but not just American police, certain American communities too, are more trigger happy than in most European.
But there's no point in acting like these protests revolve primarily around police brutality. They revolve around racism. To connect these two and turn police brutality against citizens into racial oppression, you need data and evidence to back up the claim that (white) police officers disproportionately discriminate against black people. That data doesn't exist. In fact, most data that includes the race of officers involved in fatal shootings seems to show that black and hispanic cops, but especially black cops, pull the trigger more often.
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If these numbers are correct or at least to a high degree, than the narrative about white cops shooting blacks deserves to be muted, because not only is it a lie, it's doing a lot of harm.