Moral cowardice and a vocal minority who oppose a change in the law, largely it would seem for religious reasons.
Then there is the niggling worry that such a change would lead to a scenario whereby elderly relatives were pressured by unscrupulous relatives into euthenizing for inheritance purposes, or that, merely by having such a law, severely sick relatives might feel obligated to euthenize to save their family the bother of looking after them, or that stretched health services might be too enthusiastic in their interpretation of "do not resuscitate" instructions.
Evidence from the US and Holland would appear to suggest otherwise.I applaud individuals such as this whose aim is to raise public consciousness about this issue, and try to gain proper protection for family and friends.
attached is a link to an article by Raymond Tallis, Professor of Geriatric Medicine at the University of Manchester, and Chair of Healthcare Professionals for Assisted Dying that people might find of interest....
http://newhumanist.or...se-for-assisted-dying