Aside from the obvious economic risks, Brexit offers a huge deregulation opportunity for supporters of laissez-faire politics. Labour standards, equal rights, safety regulation, environmental protection; all of these will be up for grabs. Remaining in the EU is the best way of maintaining these protections.
Many communities feel that they have been adversely affected by immigration. By properly investing in these communities, we could give the lie to the belief that economic deprivation and lack of opportunity is the consequence of freedom of movement whilst preserving our ability to travel and work freely within the EU. Win win!