Even if it doesn’t work, I’d at least want to let people try and get practice doing something about a problem (even if that’s just leaving a comment on social media to direct others to sign a petition that will eventually get lawmakers’ attention with enough signatures based on that country’s laws, because that still has more chance for good than yet another comment about X Thing Bad. Even though I agree with a lot of Lemmy’s X Thing Bad takes), makes them more likely to do something in the future. At least they can walk away saying “I tried”. Some people might see no guarantee of results for their time and think of it as time wasted, and that is their choice, but I don’t really see a reason to say “that’ll never work” without any offer of alternative. Most charitably, you are trying to save them time and disappointment and “it didn’t work, activism does not work, I’ll never do anything like that again”, but I think a lot of people are just seeing the comment as pointless negativity.