I was deported from the UK too, after living and working there (legally) for almost 4 years, so I empathize — not a pleasant experience. That black cross in your passport feels the same as I imagine a bull feels being branded — it stings.
For what it’s worth, that black mark doesn’t mean you can’t go back again. I’ve visited a number of times since being deported. As long as it’s declared.
Thanks for sharing your perspectives on how we’ve allowed this to happen — couldn’t agree more.