Migrant workers

We just read an excerpt from a novel written by Marina Lewycka called Two caravans. It is about different immigrants were the two first are spending a day in London and the second person is trying to get a job at a farm. The two first people in the story are Andriy and Irina from the Ukraine. They are visiting London for the first time and are overwhelmed by all the different sights. They talk about all the new technology and all the well dressed people and they feel like they don't fit in at all. 

The second person in the text is Tomasz who is looking for a new job in England. He finds a job at a farm where he has to catch birds and scrub out the barn. The employer he has to work for has no respect for migrant workers, he's only interested in the foreigners because he doesn't have to pay them as much as the locals. 

The main subject in this excerpt is that migrant workers often work black with lower than minimum wages and no safety or rights. Is this really fair? Shouldn't we be thankful for having some people there who wants to do our dirty jobs for low wages? Therefore we should give them enough respect to at least give them minimum wage as long as they follow the rules and do a good job.