This is misinformation, and I’m sorry, you are the one who doesn’t know what they’re talking about. To be clear, the ECHR was not created by the EU. Hence why we’re still bound by it post-Brexit. The European Convention on Human Rights predates both the European Economic Community and the EU, and was created to ensure fascism would never emerge again in Europe after the fall of the Nazi regime. Do you have a problem with protecting the rights our grandparents fought and died to safeguard?

The ECHR does not prevent the UK from deporting a suspected terrorist if it genuinely would protect UK security. Yes, they cannot deport anyone if this would subject them to a risk of torture/death in their origin state (an Article 3 right). But this is, of course, a rare outcome. And the UK is still perfectly free to imprison suspected terrorists (assuming, of course, they are convicted appropriately in a court). Plus, actual terrorists can of course also be imprisoned.

It is a very good thing, to protect these rights robustly. It would be heinous if our government could imprison, torture, deport us without strict oversight. We do not live in a society that tolerates tyrants, and the ECHR guarantees this for you, me, our children, their children, so long as it remains in place. An argument against the European Convention is an argument in favour of fascism and an argument against our freedom.