Saying " you have got a swarm of people coming across the Mediterranean, seeking a better life, wanting to come to Britain because Britain has got jobs, it's got a growing economy, it's an incredible place to live." does NOT sound like "wanting to whip people up against the migrants" It sounds like a statement of the truth - they want a better life, for whatever reason. Nothing wrong with that, and many many similar waves have washed these islands. Nothing wrong with stating the obvious, either, and nothing wrong with trying to slow down the inrush, to make them absorbable, if you use the time gained to make sure that the inevitable influx is minimally disruptive to both new and existing citizens
Comparing people to insects? But people ARE the same as insects or any other animal. They need the same basic things - a home, a source of food and a chance to raise the next generation. When they see a chance to go for these things, they go for it, all in a gang if there are a lot of them in one place. It is not demeaning to have the similarities noticed.