Are they? How do you know? Are you judging by the fact that the majority play the game by claiming asylum and we're crap at identifying those that are playing the asylum claiming game
Firstly you need to see beyond the right wing media trope that people travel thousands of miles and risk their life to come to the UK for economic gain.
Since you are so keen on evidence perhaps you like to back that up with evidence.
Since you can’t, perhaps you can explain why you think they are “playing the system”
Did you know the nationality of those coming across the channel are mostly from
Syria
Afghanistan
Iran
Eritrea
Yemen
Iraq
those are all countries with serious human rights abuses.