Although I given answer there, but I think subject should be highlight. If some one abuse merit system and after got merit just delete the post, We will not find the content actually it was deserved merit or not.
So how it will be if "Disble delete option for merited post". So abuser will not able to delete. Since merit abuse isn't moderate by forum, DT could handle this kind of case.
Usually DT never tag for merit abuser if case isn't with clear and strong evidence.
Edit:
After merit implementation for jr. Member , I think this kind of case increasing. Hope admin will consider Disable delete option on merited post.