I'm Swedish, born and raised in Gothenburg. After the Umbrella protests in 2014 five people connected to the Causeway Bay Books store in Hong Kong disappeared. One of them is a naturalized Swedish citizen, his daughter was raised in my home town. He is now imprisoned and can't communicate with his daughter, or with the Swedish authorities. Angela Gui, his daughter, is continuing on the struggle for his release to the extent she can, being only 21 when her father disappeared.
All these arguments about "leave China be" or "this isn't the West's problem" just don't make any sense to me. This is a small world, whether we like it or not, and letting authoritarian stuff like this extradition treaty to a dictatorship slide is condoning it and before you know it your citizenship, constitutional rights and passport which you thought would keep you safe doesn't work anymore and you get snatched from a street for something you've said. Your family can only cry themselves to sleep over it from the feeling of powerlessness.
We don't have to go into hypotheticals about what will happen if China gets more power to persecute people of Hong Kong. In Sweden, we already know what they've done with the limited power they hold now.