The terrible treatment of Australia's indigenous people. Slavery. Apologising for historical wrongs is quite the thing at the moment.
George Martin has just donned the sackcloth, issuing a sort-of apology to Pete Best for his part in Best getting shown the door from The Beatles:
'The catalyst that changed his life' is quite a jolly way of putting 'the person responsible for him languishing in obscurity while his replacement became one of the richest, most famous men on the planet.'
Still, Pete had the last laugh - he's still in The Beatles, albeit Pete Best's Beatles, while Ringo Starr is a struggling solo artist.