That BC could do little to hurt Germany is not disputed....but something is better than nothing and the veteran's point was that they had no other real options at the time.
Yes, something is better than nothing but the question Britain faced after the Fall of France was not do we do something but what do do. Burn down their towns or save our merchant ships? I think saving ships would have been much more effective.
As far as the veteran´s POV is concerned he is right if he refers to 44 or 43. By that time the UK had a powerful bomber fleet but it´s gound forces were also battling the Whermacht on the continent. The introduction dates of the Lanc, Halifax and the Sterling give me the impression BC as a lot less impressive in 41 and maybe even 42(Cologne Raid).