Quote Originally Posted by clearday View Post
Mostly for compatibility with existing drivers and programs. Also, most of the pen testing tools do not require or take advantage of 64-bit processing (except perhaps scanning and encryption cracking). Another way of looking at this is many software have been around since 32-bit era and still need to be rewritten to take advantage of 64-bit processing.
I do agree with clearday on the statement Mostly for compatibility with existing drivers and programs. And also if you use kali 32-bit as persistence live USB, it'll work flawlessly in 32-bit and 64-bit machine.