There's a common pattern with other safety improvements that as safety controls improve, people simply push the envelope further. Cars get safer but then the drivers also get more confident doing things that nobody would get close to doing on an old car because it would spin out before then.

With the elevated standards of megascale agriculture you have the issue now where diseases from a lettuce farm in Mexico could affect somebody's health in NYC a month later in a way that simply wouldn't be possible in a previous era.

There's no complete solution but in this particular case it's important to remember that salads are actually pretty serious foodborne—illness vectors and they need to be heavily rinsed and ideally cleaned with a bleach or vinegar solution. It's one of the reasons that salads are traditionally on the no-eat list for pregnant women.