Why don't kidnappers use simpler methods such as printing to hide their handwriting and write blackmail letters?

At the beginning, home printers were not as popular as they are now, and there were not even a few print shops. Printing blackmail letters is just a cold criminal act, which is laborious, costly and risky. On the contrary, newspapers are widely available, cheap and difficult to track. In contrast, newspaper clippings are of course easier.