It's not an excuse, it's an explanation. Did you read past the first line of my post? I'm not excusing anything. I'm determining cause and effect. If the only thing that causes a Thargoid to be hostile at us is to mess with their stuff, then if we stop messing with their stuff, we'll be fine. I'm not saying "Oh but we did a bad thing so we deserve to be shot to bits, the angry aliens are totally in the right", I'm saying that if you don't want to be shot to bits, then you should identify what causes you to be shot to bits and stop doing it. If the only condition is to stop picking up things that don't belong to us, then that's real damn easy to do. Doesn't affect human day-to-day life in the least. Surely we can swallow our pride and still our curiosity for the sake of humanity's safety.
Do you want me to apply some human perspective to compensate, maybe? To show that I'm not biased or whatever? From a human point of view, our running around and grabbing as many Thargoid items as we can, experimenting on them and trading them for profit, is an incredibly unkind thing to do. We're all thieves. We've all been thieves before we even knew who we were stealing from. Maybe it was okay then, because then it was only "scavenging", but we know now, and we still do it. Worse, these objects seem to be alive! So if you ask me to stop trying to take an alien perspective because it makes it too easy to excuse them, and instead use my human perspective, then not only are we continuing to steal things that aren't ours, we're also harming and killing innocent lifeforms for our own profit and satisfaction. We've even attacked plenty a military convoy to get at those delicious Thargoid Sensors before we learned how to reliably find them in the wild. So not only do we hold no value for Thargoid life, we don't even value human life. We take what we want no matter the cost, with no regard for anyone but ourselves, our desire for knowledge and monetary profit. We're all scum and should go to intergalactic jail for our collective crimes. That's my human feelings about all this!
No, I strongly believe that Thargoids don't have much in the way of morals, or maybe even emotions, because if they did, they would have a great excuse to commit mass genocide on our entire species by now. Fortunately, they seem to be much more objective-based than that, and all signs so far point to that they only care to fix the things we keep disrupting, and hold no grudge against us. No matter what humanity as a whole has done, an individual Thargoid does not immediately attack an individual human without provocation. They don't hate us. I don't think they care that we exist. I hope to keep it that way. It's better than the alternative.