If I read the question as if the OP is not intending a dig at farmers (I don't know it reads both ways)..
Because of public perception.
Farmers - salt of the earth, hard grafters, up at bed at 9pm, up at 2am, working the laaaaaaaand.......
Out of work/disabled benefit recipients - lazy idle work-shy scum, out of bed at 2pm, can of Special Brew in hand, down the dole office for a lovely hand out then off to the pub or the drug dealers
Our media have had a huge hand in this - look at the tv programsa nd the headlines 'benefits britain, look at mrs benefits scrounger in her benefits house driving her benefits car on her benefits big shop...'
Farm related stuff? 'Look at the ruddy cheeked farmer cuddling this lamb or driving this massive tractor'..
The truth, as ever is .. it depends. Some farmers are working their arses off trying to make a living and keep the farm going, because its what they love and its all they know.
They live their lives in debt, with huge machines on payment plans and loans, with the production costs of meat and milk being higher than what the supermarkets will actually pay, or with the risk that the weather can change any minute and a half a million quid wheat crop can become worthless overnight.
Some farmers are basically guardiansa nd keepers of large amounts of land and do bugger all but swan about in shiny rangerovers and jags shooting things and drinking gin like its water.
Some benefits recipients are idle fuckers and some have genuine claims.
I think it is easier, particularly with the media pushing the case, to single out and villify one group of 'bad guys' than the other though, and human nature to do so!