When it comes to looking back on our society from a fictional future society. it becomes entirely about the journey that got your fictional future to where it is, the events that shape your society are the events that form your societies world view.
Here is a real world example - touchy subject bare with me please Americans I have a point with this
In Australia, we used to have lots of guns, it was pretty free but we had lots of support for tighter restrictions on guns (you don't need assault rifles to hunt, you only need 1 bullet type mentality), you needed licences and such.
then we had the Port Arthur massacre (Australia) - Wikipedia
and almost overnight what resistance there had been (US NRA was supporting our pro-gun lobby >.> go figure) melted away. and a gun buyback scheme was established as well as much tighter restrictions on ownership, mental health and background checks, as well as training, being mandatory for getting a gun.
So, we had a pre-established environment, we had a crux event (the massacre), which caused change, leading to our future society (tight gun regulation because guns kill people)
So, initial world, casual event, result
your future world will look back on our world through the eyes of experience, things that happened to cause your world inform their views.
So say America now, poor gun control, chaotically regulated, lazily organised. it has massacres every other week, what crucial event might happen in your fictional world to change America's view. does it get worse or does it get better? how they view the past will be one of acceptance or disgust.
In an accepting future America, the school massacres continue, some regulations are added, but things remain mostly the same, parents start arming children, eventually arming all citizens becomes mandatory, they accept that guns have a vital place in society, they have no problem with the massacres, other than possibly not arming people sooner.
In a disgusted future America, eventually, a horrific massacre happens, hundreds die. armed teachers in the school fail to stop it. public opinion turns. guns are federally restricted and laws are put in place to ensure a minimum level of maturity and competence are required for access to weapons of different classes. gun buyback schemes are put in place and generally, people become happier as the slaughter stops. they look back with disgust at themselves and the politicians responsible.
(I understand that for American culture gun ownership is as much about a statement of personal freedom as it is about being able to shoot things or defend yourself)
(I use this merely to point out that history tells us that the course society takes often pivots on an individual event, this event shapes the society of the future, if America had such a defining event that fundamentally changed its societies views on gun control, then whatever that event was is what changed things. it could be anything.)
So how a future society views us is more about the journey and less about how things are at either end.
The journey informs our future world and its views, but there are reasons for those views.
To have a structurally sound scifi you do need to do a bit of backstory development on the history of your world
If your world needs to eat babies and be fine with that... well good luck coming up with a logical course of events for that one but yeah, your going to need, your intial conditions (now) the event (babies became delicious?) and that informs your result (now we all eat babies)
Morality doesn't come into it in the long run. morality is only an issue if the changes are short term, eg, within the current generation people remember clearly what it was like when we didn't eat babies. any future world will be fine with it if enough time removes them from the decision that eating babies was a thing we do now.