"destroyer" are those just Laws which God establishes, which spiritually revive the person who obeys them to a life of righteousness and the person who rejects them is "ruined," that is, punished with deadly, devastating, tragic consequences.  

Negative Meaning.

"destroyer" is a figurative definition of violations of God's Laws, the Commandments established by God, a symbol of man's perfect iniquities and their consequences, destroying his conscience, ruining his spirit, soul and body.