The migration camp here is surreal.
Remember the 'crisis' before this, when you proclaimed that the entire population of Bulgaria and Romania will uproot and move here wholesale for handouts and social housing, after EU lifted its transitional measures on them? Looking at the set of ONS figures for relevant years... OOPS! At the current rate, it'd take the poor souls nearly a century to complete that wild prediction, which is about as likely to come to pass as a meteor falling on every GD remember this instant! The vast majority of arrivals are productively employed, and their out-of-work ratio outperforms the native population, i.e. they still put in more than they take out.
Now you're lumping war refugees and asylum seekers with economic migrants, criminals and extremists -- great logic there, chaps!
But let's take your core argument at face value: income distribution is worse and all of us are getting poorer because the wily Johnny Foreigner is somehow capable of both taking employment away from you, contributing nothing back and claiming all possible benefits at the same time, correct? Think again:
http://www.ifs.org.uk/publications/7878
Then don't forget the GDP figures. If there are more 'scroungers' or working poor in the system than supposed strivers, shouldn't we be in negative (recession) figures by now?!
As for crime, the largest proportion of people in our prisons is white, British, poor men, with a pattern of re-offending featuring prominently in the histories of many. Their religious identification is also broadly in line with the recent census data. Should we now start locking people up by income bracket, religious identification and skin colour? No! But following your logic of one-is-many, we should, and it's absurd in the extreme.
Furthermore, if all of these refugees were the vile violent, raping fiends you proclaim, then surely the crime ratio in these categories for their ethnic and religious category would grow proportionately with the rate of their influx into the country... IT HASN'T! In the past year we got better at recording and reporting crime -- all good things -- but that's about it.
Now, 'but Muslims have different values mutually exclusive with our own [insert Christian denomination]' -- utter poppycock! I don't have a spiritual dog in the race, but all Abrahamic religions, which are Judaism, Christianity and Islam, share a common set of virtues and values, as well as core assumptions about the world. Extremists are not representative of an entire demographic, and are present in all communities. More engagement and community integration is the answer not arbitrary demonization.
'But... but -- look the terror is now on every corner!' Not really. You can keep arguing that extreme events make a trend, but the weight of data and history is against you. Isolated, homogeneous societies with 'good values' are no more or less capable of producing incidents of instability, terror and oppression than their multicultural counterparts. They are both complex systems, and fixed assumptions are worthless for tackling these.
In fact, Europe is less violent and more stable than it ever was, terrorism included. The whole project, and it is its most redeeming feature, was created so that excesses of the Soviet Union and Nazi Germany could never be repeated, and that alone is worth sticking with it for.