All the news about wrench attacks is horrific, and there are various categories of crimes that can occur; ranging from robbery, kidnapping, torture resulting in death (murder).
It should be better for anyone to never feel safe, just because there are no similar cases in their country, or only a few. A crime can happen anytime, anywhere. Therefore, maintain your security as best as possible, and don't try to flex your wealth, especially when it comes to crypto, which has significant value.
By the way, a similar case just happened in my country, and it happened just this month. I think we have a lot to learn from these cases. I believe most of them arise from poor privacy practices (due to negligence, or intentional), especially when it comes to protecting information related to money (in any form, including crypto or Bitcoin).
You can read about the case, here :
beincrypto.com - Russian Man Kidnapped and Tortured For 30 Hours