I note that the author of the article about ‘Tolkien’s black pine tree’ (Oxford Today, Michaelmas 2014, p. 12) apparently believes the myth that there are things that ‘have’ to be done (and probes even further into the realms of make-believe by alleging that accepting ‘the advice of experts’ is one of them).

I refer to the assertion in that article that the ‘University’s Botanic Garden has had to fell the famous black pine …’

No, not ‘had’ to fell: chose to fell. A wise and laudable choice, no doubt, but a choice, nevertheless.