"Paranoid destroyer" is a phrase that implies a person who is constantly suspicious and bent on wrecking everything. There are many synonyms for this phrase depending on the context. For instance, if this person is malicious and destructive, they could be called a "saboteur" or "vandal." If they are unstable and dangerous, they could be referred to as a "menace" or "threat." Another word that could be appropriate is "wrecking ball," which denotes a force that violently destroys everything in its path. No matter the synonym used, the implication is that this person's behavior is harmful and best avoided.