WHEN IN DOUBT, IGNORE. We even have technical ways to have the site do it for us, but few seem to use it and instead get frustrated with what others are saying.
It's not so simple.
There is a responsability towards the aikido people who still have not the ability to discern what is reliable information and what is bs. If bs remains unadressed, silence means assent.
OTOH, I would not like to see downvoting posts as an alternative to debate. Mob justice, censorship and anonymous bandwagoning are no substitutes for discussion.