Now don't get me started on "medium/media" ...
Use of "decimation" by a purportedly educated person to mean "devastation" sounds and is IGNORANT. It is a public school phenomenon and its user should not be proud to claim he accepted public school limits without looking beyond what he was presented there. It is not a matter of "purism" in this case but of random use of adjectives because one doesn't know what a word actually means and decimation sounds kind of like destruction and some of those other big words and, gee, youse knows what I mean anyways.