...and as I said, any account directly from a french farmer will be classed as anecdotal. Youre absolutely correct that no data exists regards 'cause'. But do keep an open mind, regards data, and what data is or isnt available.
For example, (completely digressing here) the UK government know where every cow, sheep, pig is in the UK. Ask the UK government how many serving and ex-service personnel have committed suicide, they havent a clue. Nor do they want to know. There are various reasons for that, 1/ the public wouldnt stomach the facts 2/ the impact on Army recruitment and morale 3/ The subsequent demand to act
(The US are leading the way on this however, and are now collating some of the best data in the world regards military/veteran mental health and suicide rates. The UK still not interested.)
My point being, just because data isnt available, doesnt mean no issue exists.
The individual cause of a person taking their own life, will always subjective, emotive and disputed.
The french farmers however, have not been shy at publicising their plight. If they say they are marching on Paris due to staggering drops in commoditie prices, over production in the eu from cheaper eastern states, and their subsequent inability to make a living wage, who are you to say they are lying? Not only that, but the french government have indeed responded to the crisis by instigating controls over imports and production, to elevate prices.
But perhaps youd like to demonstrate that there is no link whatsoever, in which case, Id be far more content and support can be directed at a social issue rather than an economical one. Your view would also save the french government millions.