Witnesses are an irrelevance to most people. Those of us here will have our opinions about the relative dangers of being inside the organisation but to the overwhelming majority of people who have no links to Witnesses then door knocking and carts mean zero, absolutely nothing.
Laws that give us all freedoms in the West also allow JWs to go about their business. Ensuring the facts, advice and experiences of those who have escaped from the organisation are as widely available as possible is the best way of helping ones that may be curious.
Let them do their carts and their public ministry. Who really cares? Virtually no one. Far better, IMHO, to try and find ways of getting those that are in to engage with sites and information that will make them question their beliefs.