You are batshit, sorry
Wolves are not invasive. Invasive is a species that was never an endemic population, which wolves were - along with lynx and bears, and wild boar and bison. And wolves were wiped out - not through natural selection, but by persecution and hunting by humans, quite often just because the posh boys wanted to hunt stag in the royal forests.
So it wasnt anything natural about it.
As a result the fragile ecosystem that you are banging on about has been seriously out of kilter, as the apex preditors were removed from the cycle and everything has gone out of whack since then. If you think our ecosystem in the UK is in balance you are having a laugh!
the reintroduction of wolves in places like Yellowstone, which I grant you is a far larger reserve than the East coast of Kent - has had beneficial impact across the board on flora and fauna.
If you want to take a look at what damage is happening to woodland, take a look at the ancient woodlands across Sussex which are being devastated by deer populations. Those deer wont be living their best life because of an absence of wolves - many of them are shot.
Wolves dont like people much. They are not avid killers of children. They prefer their natural prey. And of course they wouldnt fit into a heavily populated place. But in the wild areas? Why not. Im pretty sure there are some on the big estates in Scotland, so perhaps you should worry about the ones who are already here heading south, rather than pretend escapees from Belgium.
And as to 'how did they get to Belgium'? Well on the unpopulated wild areas at the boarders, Im assuming they just extended their territories. They cant read maps you know, no more than they can swim 20km or sail boats