Wow. This is the "randomly shooting a gun at a train with no specific intent to kill someone" type scenario. It's reckless behavior so likely to cause great bodily harm or death to strangers than it's the equivalent of actual intent to murder.
It's more leaving a loaded and likely to malfunction (randomly go off) gun on a train and not caring that it will, but yeah. It's clear reckless endangerment to an absurd degree.
The villains ARE NOT human and don't care about hurting humans, they just don't actively seek out too.
Which is why violence is likely. That said, no one has yet been killed, so there is a little room for fixing the situation (though few good aligned groups would, in any way, trust that this group wouldn't go back on any word they give).