BC
An excellent point.
I should have thought of it. All of us who do / did emergency service work rely greatly on knowledge of the patch. It is unlikely that any pilot living in the Glasgow area and operating out of the SECC site would be unaware of the Clutha.
If I had found myself committed to an autorotative landing over Glasgow city centre, and I had any control available, I would have gone for the river. At least you know what you are going to hit and you know that you are unlikely to kill anyone else.
This suggests to me that DT had few or no options.