It is done to indicate that one does not consider the somewhat similar things one is speaking
of to be equivalent in chashivus. Pausing between those phrases is so that one
does not sound as though they are speaking apikorsus.
To me it seems logical. IT is offensive to lump different things together even if there is a similarity.
For example when a paper writes “Two dead in new round of mideast violence” While true it is offensive when the “two” are victim and, lehavdil the terroristt. Or when a President blames violence on “Many sides many sides” it maybe true but lumping them together is wrong.