Stupid Crooks

Watching "Dateline" last night about a wife having an affair who kills her husband, chops him up into pieces, puts the parts into garbage bags and then into cheap luggage, then tosses the bags into the ocean. Of course they turn up on shore and the cops solve the crime by tracing the luggage, garbage bags, etc. Here is my question: wouldn't be a lot smarter to just get a shovel and bury the parts in the Earth some where. They wouldn't be floating up a month later. I'm not advocating murder and I'm glad this woman was caught. But this seems so basic.