I wish non UK residents would not just sound off without correct and fuller information.

The UK gets many many benefits from being part of a peaceful confederation. Said benefits include environmental protection, workers rights, and free medical care for UK citizens in Europe. Not to mention human rights.
All of those things will be rolled back or dimished. UK's own government is both a monarchy and a kind of elected dictatorship without the checks and balances of recent properly constitutional polities.

The UK has more non-EU immigrants than EU ones. WIthout immigrant labour, the health service and care homes for the very old would be even unsustainable.

If people perceive pressure on services and resources, that is because of a conservative government's failure to invest in the infrastructure for health, education, and transport because of an ideology of austerity that coexists with a drastic increase in social inequality and uneven distribution of wages.

The small landmass of Europe had one of the bloodiest more war-ridden histories of any corner of the earth for many centuries. Now it is unthinkable to imagine armed conflict between EU states.

The UK has not lost sovereignty. It can vote on EU legislation and has opted out of a large number of provisions. If it leaves the EU but wishes certain kinds of trade agreement, it will still have to pay in and accept other provisions, but without any chance to negotiate them. Just look at Norway.

US-ians would be shocked by many aspects of non-democracy in this constitutional monarchy. The UK does not have a democracy. It has monarch and a plutocratic/kleptocratic system for protecting the power of the rich.

And now the media his been rife with toxic hate-stories fomenting division and hatred. And lies. This is one of the most prosperous countries in the world. There should be enough for all if it were divided more equally. People enjoy free health care and a standard of material comfort unimaginable a century ago. And yet they feel that there is not enough to go around. That hatred led to tragedy a few days ago.

No: getting out will not lead to freedom or prosperity. It will remove some of the few
checks that help peace, human rights, social justice and other humane values and lead to untrammelled progress towards an ideology of cuts, austerity, profits for the rich, selling off of public assets, zenophobia, racism and worse. As many have already pointed out, the leave-campaign and UKIP are drumming up sentinements reminiscent of 1930s Germany.