Earlier quoted context omitted.
The UK has famously strict libel laws, and notably the burden of proof is on the defendant to prove the truth of their defamatory speech. https://www.burnetts.co.uk/publications/blogs/libel-and-slan... https://en.wikipedia.org/wiki/English_defamation_law
Before 2013 in the UK, not even truth was enough of a defense. Truths that caused harm (even justifiable harm) were still actionable. In Austria it's still illegal to make true comments that offend religion sensibilities.
Wasn't justification a different name for a truth defence?