I'm reluctant to say any particular tool can only be used for bad. I figure if a bad guy has certain tools, then at least some good guys should have the same tools. (That's an uncomfortable reality of this world.) At a minimum, being an expert on breaking-and-entering equipment naturally makes the person an expert on how to counteract such equipment. The first step to being such an expert is to own or have access to the breaking-and-entering equipment.

Anyway, I can imagine at least one other acceptable use for breaking-and-entering equipment. Imagine somebody stole your stuff and put it inside a locked building on their property. You went through all the legal channels to try to get your stuff back. (Or if it's TEOTWAWKI, there are no institutional legal channels available.) In such a situation, I'd rather use breaking-and-entering equipment than use brute force.

Another use is if you or a neighbor no longer has keys to the particular lock for whatever reason (key is lost, stolen, damaged, etc.). Brute force may cause more damage or commotion than you're willing to allow.

Further, a shotgun or crowbar is still breaking-and-entering equipment. It just falsely puts you on a moral high ground, and you may not be using the best tool on top of that. Always try to use the best tool.

(By the way, I don't own any equipment that is specifically for breaking-and-entering.)