But if I'm honest, I may have a clue about the answer. Conservatives welcome monopolies if they have been legitimately created, because they fetishise the laws of the market, even when markets fail.
Socialists welcome monopolies because they have an old-fashioned and fatal attraction for strong, centralised authority, which explains perhaps why Blair and Brown preferred a few monopolistic retailers - they felt, rather naively, that they were easier to control.
Do we really believe that handing ownership of seed technology to a handful of global corporations will make them easier to control?
If GM is ever going to work, it has to create more competition in the market, not less - and more diversity, not less. It has to specifically help small farmers.If it helps small farmers now, then it does so despite the growing monopoly involved, not because of it.