1a. Illegal immigration has nothing to do with visa based, legal immigration. illegal immigration is the type of immigration people are upset about here in the UK. most people have no problem with legal migration.
1b. anyone claiming the UK’s legal migration is any sort of problem right now, or in the past, should probably not be listened to in any way shape or form for anything they have to say on the matter.
2. a lot of the folks who have illegally entered the country end up asking for asylum, and by law their claims must be processed
3. the dublin convention states something along the lines of “asylum requests must be processed in the first EU country the person entered into”, ie it’s possible to remove people claiming asylum if they initially arrived in a different EU member state country
4. most people get to the uk having traveled through EU member states, because geography.
5. we left the EU, we cannot do 3 anymore. so we have a bunch of people stuck in hotels waiting for asylum claims to be processed.
illegal immigration got worse because we left the eu.