anybody?

If you had another look to your text you would perhaps recognize that it is not exactly clear in itself, and neither is your question.
The second sentence is incomplete.
The next sentence states clearly that the person involved is "_not_ in favour of legalisation", whereas you ask about him being in favour.

I think you are right though in supposing that the people won't like the person and show him their teeth.

If you are seeking an explanation of causality (as to WHY he is _not_ in favour, where he would rather be) I cannot help you though.