From what I can see, there are valid reasons to oppose Brexit and valid reasons
to support it.
Personally, I don't know enough to have an opinion on Brexit, but I've been reading about it.
Here is a pro leaving argument:
Brexit: the 7 most important arguments for Britain to leave the EU
On Thursday, Britain will vote on whether to leave the European Union an option dubbed "Brexit." Its expected to be a close vote, with the "leave" side currently enjoying a razor-thin 1 percent lead in the polls (45 percent for "leave" versus 44 percent for "remain" .
Although the "leave" campaign has often focused on emotional arguments about immigration, there are in fact many reasons those in favor of leaving believe it will benefit the UK. They come from across the political spectrum, and some of the arguments even contradict others. Here are seven of the most significant.
<snip>
read:http://www.vox.com/2016/6/22/11992106/brexit-arguments
Editorial from the L.A. Times:
Brexit would be a disaster for Britain
On Thursday, voters in the United Kingdom will decide whether to remain in the European Union. That the electorate is apparently so closely split between the options of Leave and Remain is ominous. At issue in this dramatic struggle over Britains identity, culture and independence is nothing less than the future of the 65-year move toward a closer, more integrated Europe.
On the merits, the Remain option supported by Prime Minister David Cameron should win overwhelmingly. Britain benefits enormously from its participation in the 28-member economic and political union, and the consequences of withdrawal could be catastrophic for the British economy particularly for Londons role as an international financial center.
<snip>
http://www.latimes.com/opinion/editorials/la-ed-brexit-vote-20160622-snap-story.html