Please don't invent strawmen.
The point is simple, and commonsense. The 'athletes' who tend to play football in Britain, broadly, have mediocre education (Lampard's an exception i think), mediocre non football prospects, and the opportunity for vast, vast wealth if they make it.
This combination simply doesn't exist to the same extent in any other sport, except possibly, to a limited extent, rugby league.
When the possible gain is so much greater, and options so much poorer, the risk to one's 'honour' seems rather more palatable. Especially when the public esteem for footballers ain't that high to start with.
With very singular exceptions, no-one's makingmillions from rowing, and most rowers have perfectly fine career prosepcts, being largely university educated - A 2013 Gold medal winner retired this very day, at only 27, to become a lawyer.
Bannister famously fitted his 4 minute mile inside his medical studies; Roger Black, erstwhile competitor v Michael Johnson, was a qualified doctor.
Few people dope because they 'want' to. They dope because they tell themselves they need to. Some or probably even right in that suspicion. Cycling on the continent was a working class sport, for many their only route to fortune.
When you have more palatable alternatives than shooting up, it's just commonsense that you will be more likely to avail of them.