Upvote:1
The reason that was given means that at least one Schengen country considers you, personally, to be a threat. That's much more specific than "justification for the purpose and conditions ... was not reliable" or "intention to leave ... could not be ascertained." They believe that you match a person in a terrorist threat database or the like (e.g. a criminal database).
Either way, a new application will not help until this is cleared up. As phoog mentioned in his comment, read the linked answer by Henning and get a lawyer.