The UK system has a facility for would be immigrants and refugees to apply where they are so they do not have to trudge across Europe. They choose not to use it.
A great number of the people arriving by boats across the channel are economic migrants not people suffering from persecution. If the seek to sneak into this country with out going through the correct procedures then they are acting illegally. You can huff and puff and be as indignant as you please but it won't change that fact.