Artificial Sweetners - will they kill you or not?

The diet soda’s in the early 70’s were horrible (Tab was probably the least bad IMO), but I drank them nonetheless. Today’s soda’s with aspartame are great.
I’m not a heavy soda drinker, but when I do want one (e.g. diet code with pizza, or an occasional AW diet root bear float) I don’t worry about any cancer risks. Aspartame has been one of the most tested food ingredients in the world and unless someone thinks there’s a huge conspiracy, for the vast majority of the population it isn’t a health hazard (used in moderation, of course).