> keeping my client information's integrity is as important to me as keeping the financials

Nobody is questioning your intentions. People writing apps in memory-unsafe languages don’t give fewer shits. They’re just more prone to certain classes of errors.

> how the `1/0=0` problem can be entirely avoided

1/0 problems are generally expected to be entirely avoided. This is about where the system behaves unexpectedly, whether due to human error or the computer being weird.