Is this where we're going? Why is it (apologies to Andy Rooney for borrowing his tagline) that so many English writers insist on putting apostrophes before an ending 's' when there's no reason to do so? In English, there are two -- AND ONLY TWO -- reasons to use an apostrophe.
1 -- To replace the "missing" letters in contractions (e.g., can't, shouldn't, might've, she'll, I'd've)
2 -- To indicate possession (Tracy's book, the school's principal [and note the spelling of 'principal'], Occam's Razor)
I suggest that if one is inclined to insert an apostrophe, think twice and ask oneself if one is writing a contraction or indicating that someone or something possesses the item(s) immediately following.