List of known attacks against people who own Bitcoin and crypto assets are getting bigger every day, as we can see in Jameson Lopp github page.
Who knows how many similar unknown attacks are happening all the time but they never got published for various reasons, maybe victims are scared, they don't want publicity and they just never report the crime.
It would be a good idea to go through this previous cases and learn from their examples how to avoid getting attacked for owning Bitcoin.

Only this years there was four known attack on people, two of them happened in Hong Kong, and other two happened in Europe, one in Poland and other one in Sweden.