Because they have grown to be very common in modern society. Especially the usage of Credit Cards today, they're more viewed as something that's holding debt to the banks than a status symbol. Perhaps 70 years ago when the first Credit Cards were issued to important clients, they were good targets for robberies. Currently, no. Credit Card holders usually have more debt than wealth.
I'm debating because of the novelty of cryptocurrencies, and how some of its HODLers are probably in a path of accumulating wealth because they are HODLing the right coins. A smart criminal would target them, and one way to find that target? Hardware Wallets.