Take your pick. I'm sure it covers all angles because it very much gets discussed in person from all points of view. The biggest one comes up about it is the threat of cheap labour that the ones of the past spent ages building up good wages over the decades. Even though they too were once on very bare minimum wages all bunked up.
Illegal then.
Why should we support illegal immigration? What positive do we have from it?
May I ask what your background is, out of interest? I only ask because I come from a working class family on a council estate, I've never met anyone that has made the "took err jerbs" argument. I also come from a background that has legal immigrants in it. People who integrated and are well loved by their communities. People who, much like me, detest the open borders let any old bugger in approach we've suffered.