No, it´s not.
I have one lockpicking geocache listed by my self and I have found several others. None of them was ever opened by brute force.
It have to be obvious whats to do, it has to be clearly described, and it has to be hard to destroy it.
Some cachers might overpace when they don´t get to log real quick. But are there realy cahers out there in your bad bad world, taking the decission to destroy a cache by full intention, using tools or stuff??? I don´t think so. And if so, one of a thousand or so came along. And replacing a cacher after a thousand or so founds wount hurt