I can't answer for Stanron, of course, but one 'reason' I have started hearing more often is that "our parents/grandparents fought to be from of Europe and you dishonour their memory if you do not want to leave."

Pure emotion, of course. No regard for or interest in whether we will be better, worse, or completely collapse. No factual basis at all. Just armchair warriors who somehow think they are doing their bit in the last war.

But I think quite a lot of people could be persuaded by it.