Would pointing out that one believes another is a

Would pointing out that one believes another is a compensated FUD promoter be considered to be a personal attack? I don't mean to be pestering posters, but for the life of me I can't justify why a same group of posters would spend such a great deal of their lives posting and re-posting only negative comments regarding a company, unless they were benefitting. It's way too obvious to most what it's all about.
Thanks 4k