In the absence of clear Rabbinic guidance from respected Rabbonim (not aguna activists-see below) I don’t see how anyone can get themselves involved in a fight that doesn’t pertain to them and don’t know both sides of the story.
I’ve seen video’s of Aguna protests. Some of the people in the crowd looked like they were relishing the opportunity to fight with and harrras someone else. I won’t even start with those who harras family members…
A certain rabbi who was a major aguna activist (he no longer is due to external factors) told me point blank that he takes it for granted that a women coming to him is the victim and saying the truth even without speaking to the husband.