1. You have largely answered your own question i.e. these addresses are already publicly available.
2. Why shouldn't we use their line of business as a reason? These people are truly despicable.
3. Given 1. there can be no question of the use of these addresses being actionable. In the public domain is in the public domain.
These people have been openly challenged to sue us. They have singularly failed to do so for blindingly obvious reasons, just as they have failed to take the MDC for the same reasons.
Suspect you might feel a bit different if one of your relatives was blown to bits because they had relied on one of these devices.