Not necessarily. It's easy to forget that attacks typically depend on, admittedly very common, multiple layers of security failures. For example, using the same passwords on many systems, etc. Good security is defense in depth. Keeping every component as secure as possible and keeping any breach of security as restricted as possible. It may not be possible to avoid every conceivable attack, but it's certainly possible to withstand a large number of attempted attacks.

The other side of the coin is that attackers don't publicize their losses. Every attacker has a limit to their skillset. If they can't compromise someone they won't announce to the world their failure, they'll just pretend like nothing happened and move on.