These actions can be classed as slacktivism and as impotent virtue-signaling, sure, but I believe that the actors of these methods of protest are trying to do what the left calls "creating safe spaces" and genuinely feel that they are "showing their support" and therefore somehow...helping. The thing is, they may be achieving that first part - creating a safe space, perhaps unwittingly marginalising, demonising, and isolating the very people who can affect the most change (i.e. politicians, policemen, russian people, going by the examples of causes in OP's post alone), at a further cost of inconveniencing absolutely everyone - testing the resolve of existing allies, and likely creating new opponents out of those who were on the fence or apathetic.