At least scouting taught me to leave a place better than I found it. (Not that I always succeed, but it's worth trying to keep doing better.)
If aliens exist, their values and morals would likely be very alien to us.
I happen to agree with this one. But there is no universal truth either. So if you combine this, you get that universal morality doesn't exist either.
Morals are being decided and dictated by those who can get most people to agree on something being moral. It's a purely man-made thing that only distracts from what everyone's born with: Actual empathy.
Morals are for people who need moral guidelines, because they lack the sense that enables them to feel what another person feels.
Shared morals are among the top features of every culture. It's not something that's dictated, many try, but don't be fooled. And it's not a distraction either. People have a varying amount of empathy, emotional energy to operate empathy, and a different emotional intelligence and experience. So even if someone doesn't have the capacity to process a situation and act with complete empathy (the existence of which is debatable), they can still manage it well with morality "mechanically". In fact it's one of the ways to train yourself to feel actual empathy.
That would make it pretty tough to define. Perhaps that is the point.