If they were ineffective but people thought they were effective they'd act like they were effective and go do things that would get them infected, falsely belie

If they were ineffective but people thought they were effective they'd act like they were effective and go do things that would get them infected, falsely believing the mask would protect them. They appear to have turned out to be effective (FYI: I've warn masks every time I've been outside since 2020/3/16 so I'm certainly on the side of masks) Will you downvote this because it shows a logical flaw, not a judgement, but it you probably disagree with it?