You’re conveniently forgetting that the 38th parallel was an arbitrary border drawn by some white guys on a map

You make it look like it wasn’t agreed by both the US and the USSR, which it was.

and that Korea was, albeit incredibly briefly, a unified Socialist state in 1945, prior to the externally imposed partition of the peninsula.

Do we consider partial Soviet occupation an “unified socialist state” now?

while the north did cross the 38th parallel, border skirmishes went on before that point, and who truly “started” the war is murky

No it isn’t. There is no doubt that North Korea started the war, unless we are willing to be naive enough to believe that Operation Pokpung was planned and carried forth in response to “border skirmishes”. NK was stockpiling vehicles, ammo, and weapons, provided by the USSR, for a full year before June 1950.