Valentine, your post is a tad bitty, so its not clear when you talk about costs of rent or visas etc whether youre simply arguing a migration pov and the impact of overcrowding on our housing stock.
The youth unemployment stats across the EU speak for themselves and accounts for why the youth of europe (and further afield) have flocked to the UK.
But you ask;
"Could our involvement in those fucking illegal wars (that have finally led to this cross ocean "immigration" of refugees from those destroyed regions) have been prevented by an EU vote had we BEEN in a joint army then? It is an extremely important question that needs to be discussed."
The answer is absolutely not.
Re Afganistan, The United Nations Security Council passed resolution 1386 in 2001, which followed on from the Bonn Agreement.
https://en.m.wikipedia.org/wiki/UnitedNationssSecurityCouncillResolution13866_
https://en.m.wikipedia.org/wiki/Bonnn_Agreement_(Afghanistan)
NATO then acted on those resolutions. Heres a list of Nations (I may have missed a few) who supported action in Afghanistan.
Germany, France, UK, Spain, Albania, Armenia, US, Canada, Australia, Austria, Azebaijahn, Belgium, Bosnia and Herzegovinia, Bulgaria, Croatia, Czech Rep, Denmark, El Salvadore, Estonia, Finland, Georgia, Greece, Hungary, Iceland, Italy, Jordan, Latvia, Lithuania, Luxembourg, Malaysia, Mongolia, Mintenegro, Netherlands, New Zealand, Norway, Pakistan, Poland, Portugal, Macedonia, Romania, Slovakia, Slovenia, South Korea, Sweden, Switzerland, Turkey.
When you then turn to Iraq, I absolutely agree it was an illegal war and Bliar should be in prison as we speak. Whilst domestically weve pressed for the Chilcot Report into Bliars role in the Iraq war, we have shamefully not acted on it. Would some overarching EU Defence organisation avoided this? Absolutely not. Mainly for the same reasons the UN didnt, but also because one of the aims of the EU is to spread the 'light' of western democracy.
All of that apart, the bottom line here regards an EU army, is costs, not some idealogical progressive 'keep the peace' movement.
From the 1960s to 2009 France refused to be a military member of NATO though retained their seat politically. The one reason for this was costs. The very same reasons that only a handful of EU states meet the 2% of GDP required to be spent on defence under the treaties. Most other EU states spend between 1 and 1.5% of GDP.
This may seem 'academic', but to put that in context, the US spend approx 3.3%, Russia spends 5.4%, Saudi Arabia spends 9.8%, Oman a staggering 13.7% of GDP. (No figures available for North Korea).
It is staggeringly foolish to set up some alternative to NATO, which has maintained peace in europe for 60 years, when 90% of the proposed member states (EU) have no stomach for increasing defence spending, and no political concensus.
Yet here we are, and not one eu citizen has been consulted......