This link, which has already been posted to this thread, talks about DWPs own investigations.
http://www.disabilitynewsservice.com/one-in-five-benefit-rel..."benefits changes cause suicide" is not in any way controversial; pretty much everyone accepts that it happens. Financial instability is well known and accepted as one driver for suicide. What people normally say is that the rate of suicide in people who are sanctioned is the same as in those who are not sanctioned - but I'm not talking about sanctions, but about all the changes. (Reduction in support for ESA claimants in the work-related activity group; refusal to help complete forms; etc)
> Pretty sure this isn't what they do,
Pretty sure this is what they do, because I speak to people who have had their benefits suspended.
One person did some voluntary work, and declared it. DWP wanted more information, and sent a stencil, but it got delivered to the wrong address. The first the person knew about it was that their benefit hadn't been paid. (They were due to get paid on a Friday. Not getting paid left them with no food over a weekend - this is one of the reasons so many people are using foodbanks. The important bit about this anecdote is that because the person was claiming contributions based ESA with permitted work at the higher rate the voluntary work (which had already been fully declared) was irrelevant to their claim - it couldn't have had any effect.
You do know that a benefit suspension is different from a benefit sanction, right?