Agreed. Although it's not just the "weak" - those wrapped in grief are not necessarily weak; simply unable to cope with it.That is the sad reality.
It's a case of supply and demand.
The weak looking for a crutch and predators who are all too happy to provide them.
Sometimes unconsciously, as can be witnessed on this very forum. Generally quite maliciously as can be from those examples making a fortune off the back of it.