The question was why free movement and free trade need be intertwined.
My answer was thus:
"The single market stands on 4 basic 'freedoms' the free movement of goods; workers; right of establishment and freedom to provide services; and finally free movement of capital.
For me, each freedom is an intrinsic part of the single market, none more important than the other. I firmly believe that. I've worked all over the world and outside of Europe had huge issues setting up businesses and determining my right to do business, employ people, create products and services etc etc. Yet in Europe none of those issues exist, and I believe that to be a huge competitive advantage for businesses but also employees as well."
I provided an answer that put into context, answered why and demonstrated why trade and freedom of movement should be entwined not only in Europe but how when there is no freedom of movement or indeed restraints on movement it affects trade by making it more difficult.
You may not agree with freedom of movement, that is your right, but undoubtably trade and therefore people benefit as a result.