You might not like the advantages, but there are advantages:
* exit from an EU which is "post democratic" and with a "democratic deficit",
The EU is one huge overgrown trade agreement. of course it is not democratic, because it is under the firm control of the member nations, who between them decide what happens next. Indirectly it is totally democratic, because all its important officers are appointed by the democratically elected member giovernments or elected directly. There is no democratic deficit.
What leavers usually are complaining about is that the Uk does not control the EU. how could it control a democratic EU when the Uk is only about 1/10 the total poulation. However, since every nation has a veto on changes, the Uk can prevent any changes it does not like. thats pretty powerful.
a monster that has in Greece committed the crime of economic colonisation
Pah phooey. The greeks had the choice, take it or leave it. no one invaded greece. they were totally free to do anything they liked inside their own country. They might have no good altenatives to taking the EU offer, but that was Greece's fault, not the EUs fault. Greece got into the situation.
and which has caused enormous damage to Italy, Spain and others.
Ditto. What makes you think they would not all be in worse situations if there was no EU? I think they would.
That is the fundamental truth about the EU. It isnt perfect. it is a compromis between ithe interests of different countries. But it is better than nothing. (a lot better). As the Uk is finding out.
* exit from the world's slowest growing trading block.
So would you rather the Uk was more like Zimbabwe? because that is the choice. of course the EU is amongst the slowest growing nations...because its RICH RICH RICH. It already has all the things these countries only aspire to.
* a rebalancing of the UK's trade away from the EU and towards other nations.
You mean, a slashing of the UK's trade with the EU but no change to our trade with the rest of the world. So basically we end up selling 20-30% less abroad. Great. fantastic. How do we pay for that huge loss of national income? Our trade with anyone else is not going to magically increase because we are no longer selling to the EU. Much more likely it will also shrink because we lose the benefit of trade deals negotiated by the EU.
* control over UK's border.
if the Uk goes broke immigrants might stop coming. Only might. We will still ask the doctors and bankers to come here because we want their expertise. We will still ask the rich to come here. We will very likely still end up asking those willing to work for peanuts to come here because they are cheap and actually making money for the rest of us. I doubt immigration will go down if we leave the EU. All that might happen is more Chinese and africans, and fewer French and Poles. Do you honestly think the ex BNP supporters now propping up Brexit will like that?