That being said, Barry may believe that multiple persons pose more of a threat than the "drug addict," which is not an unreasonable assumption, though it could be wrong. Moreover, he may feel more under threat now because of all the social media posts engendered by Suzanne's disappearance.
Barry believes the drug addict poses sufficient threat and danger that he proposed him as a suspect in Suzanne’s disappearance, that can’t just be hindsight -something made him feel he was very dangerous (if he exists)