Rule #1 about databases: It will be hacked. Rule #2: see rule #1
That would imply that security is irrelevant. Maybe you should re-work your rule the say that it will attempt to be hacked. Therefore you should always worry about security.
Of course we shouldn't just 'give up' and stop trying to improve our security, but the unfortunate truth is that breaches are practically inevitable. In addition to constantly striving to improve our security, our society also needs to start investigating ways to make it so that breaches are less impactful (for example, stop using SSNs as any type of secret identifier, so that if an SSN database is breached, it doesn't matter).