For example, I was working on a system that handles holdings and trading information at the fund level which covers AUM that starts with a T and ends in rillions. There was an SQL injection vulnerability with schema owner access. Luckily this was an internal app, but still there are trade desk devs who could accidentally paste a drop table statement with a name collison. Anyways, I brought all this up to the principal. I was told this isn't a real big deal because they have real-time backups. I asked if they ever tested the backups... no. Do they have procedures for restoring from backups... no. They go nuts if there's a 5 minute outage, so how long would it take to restore... no idea.
Trust me ignorance is very believable, even in regulated industries.