I agree. It's the greed of the charities and their propensity and ability to enter into and fund this sort of litigation which I find so distasteful.
This is difficult for charities. I have been on either side of such disputes with charities.
The trustees of a charity have a simple duty in law to protect its assets. A gift to them in a will becomes an asset.
There have been times when certain large charities acquired a reputation for aggression in such situations, but in general such situations should be approached on an individual basis.
I find the creation of a class of charities 'with which the deceased had no connection' to be muddle headed. I know, for example of situations where a valid reason for a gift has only become clear well after the event.