On moon destruction missions, they are the go to strategy against any large fleet and any competent fleeter because anyone who knows how to fleetsave will not leave their fleet sitting and will do it from a moon. So unless you are lucky enough to catch them on a bad day or find their fleet lazily attacking a target you will usually have to go through the moons to find a fleet. There is a risk/reward to that, as you can lose a lot of RIPs in the process to find their fleet wasn't even there. Basic strategy to combat this is to keep your fleets going on deployment missions between moons, as I always do. Also, if it is such an issue, game mechanics provide a defense for this, there is a reason there is a shipyard available to build on your moons, use it to put defenses on them and they will have to either clear out the defenses or send more rips/extra attacks to get through for the moon destruction.
On defense bashing, this universe is a defense into debris field universe and if someone is cleaning up the debris I see no issue with someone poking down your defenses. Don't build too much defense or you will become a target, and use a good defense ratio so it is harder to get profit from it.
On debris field stealing, nothing to be said there about should you or should you not. Profit is profit. If you are losing debris fields, make sure your recs arrive not much later than a minute after your attacks. You can send the recs first and determine if your target is online or not while waiting for the attack mission to get closer to the same timing, saving your deuterium if they do come online.
As far as Dalton goes I'll give them some props for being the main fleeters of the universe and the third group to find my fleet and take it, one of those bad days for me. Though I often see them making slight mistakes and it adds to my theory that these less populated American servers have fewer experienced players as a result of less competition. I am up for their challenge but there is not much I can do without a fleet currently and few to no one to support me. We will see about that after the merger.