Here's a slightly different version from a concordant literal translation. The puppetmaster did not actually destroy the bad puppet because he was just doing the job he was created to do. When his job was finished, his power to be bad was removed, and he became a good puppet who was really glad.
"thereafter the consummation, whenever He may be giving up the kingdom to His God and Father, whenever He should be nullifying all sovereignty and all authority and power. For He must be reigning until He should be placing all His enemies under His feet. The last enemy is being abolished: death. For He subjects all under His feet. Now whenever He may be saying that all is subject, it is evident that it is outside of Him Who subjects all to Him. Now, whenever all may be subjected to Him, then the Son Himself also shall be subjected to Him Who subjects all to Him, that God may be All in all." (1 Corinthians 15:24-28)