The 630 on the Aquarius are just a handful compared to what the Spanish Coastguard is picking up out of the water, hundreds of whom are, already dead. Over 900 were rescued last weekend, alone.
You, in the UK, are lucky that you do not have that moral problem--just listen to what the politicians say and get the pictures on the tv. Armchair politics. Spain and Italy are on the front line so, what are we going to do---let them drown?
I believe that EU will bring in legislation. In the meantime, we have no moral choice in the matter.