That was solid. Nice way to handle a direct personal judgement!
Not your first rodeo.
Another way is to avoid absolutes and ultimatums as aggressively as one should avoid personal judgements.
Better phrased as: "we did our best to prevent this scenario from happening again.
Fact is it just could happen! Nobody likes that reality, and overall when we think about all this stuff, networked computing is a sad state of affairs..
Best to just be 100 percent real about it all, if you ask me.
At the very least people won't nail you on little things, which leaves you something you may trade on when a big thing happens.
And yeah, this is unsolicited and worth exactly what you paid. Was just sharing where I ended up on these things in case it helps