I think a lot of people conflate immigrants wanting to come the UK with where the smugglers bring them. It's not like booking a plane ticket!
How people imagine conversations with smugglers go:
The people on boats are given a lengthy and balanced consultation with their smugglers where they have a cup of tea, map out the pros and cons and explain the risks versus rewards of this undertaking. The smugglers explain the political mood in the UK and that the British public is angry about the routes to England they offer.
Oh but you have no home, all your schools have been bombed, you have no chance of a job, you only have this little money and hope. Ok, the smugglers say - we will try to help you.
If you survive the journey we offer to France - we will then put you on a dinghy - they then carefully explain the weather and how different a dinghy is from a boat.
They further explain that they really should claim asylum in France as it's also a safe country and English people are angry they don't do that.
But, sure if you want to pay me three times as much for the journey to England as you would to France... I will help you.
How conversations with Smugglers go:
Pay us this money and we'll get you to England. You definitely won't die. You'll be put up in a hotel there while they assess your claim. Make sure to get rid of all your ID as that will help your claim. Thanks for your life savings.
The issue is not the people coming - it's the smugglers bringing them here.
Do you really think the people going back have so much to go back to?