From the pragmatic point of view, I understand the argument that says that the UK should stay in the EU because if we leave then international businesses will go elsewhere and many jobs will be lost. But from both moral and ideological points of view, the reasoning stinks. In fact, it is economic blackmail and the sooner we sever our ties with this neo-liberal institution, that exists to enrich and enable the multinationals at the expense of local companies, the better.
Yes, it will cost us big-time. But that is invariably the way with doing the right thing.