The Chinese absolutely bear responsibility for how they've governed the last 30 years, just as the British bear responsibility for how they governed the prior 150.

The fact that British HK liberalized a little at the very last second before handover is better than nothing, and the National Security Law is definitely bad, but right now the scoreboard is 7/150 years of free speech under the UK, compared to 23/28 years of free speech under PRC. It'll take another 100 years for the PRC to have a worse record than the UK.