Whether or not the culture in your organization is willing to accept that defects are not inevitable, you still need to increase the knowledge in your organization about defects; how they are discovered, managed, and fixed.

Automated testing exists for the primary purpose of helping to ensure that everything that your team is doing today does not break anything that your team did yesterday, the day before, and so on. Also, the tests that you write today will be the tests that you use going forward. And, the net result of having automated testing is the same as having incrementally developed regression testing.