in my interpretation of how portals work - by joining space together - moving through a portal doesn’t involve infinite speed because you haven’t moved - the portals have just changed the space you occupy.
a bit like the inertialess/ Alcubierre drive where you travel faster than light without breaking any laws because you’re not moving at all in your space, it’s just that the space you occupy changes.
in the reasoning the people hurling towards the portal only appear to do so, once they pass through the portal they’ll be as immobile as they were before entering it.
the minute physics video is fun though. love their stuff.
you make an interesting point and it reminds me of a counter point: that modern wars might have higher death tolls than historical wars, but modern wars - with modern weapons - end up costing less life overall compared to the populations of the time.
for tribal conflict of humans past, victory could mean wiping out the other tribe - 50% death toll or higher. as weapons advanced and more efficient and more destructive tactics emerged, wars can be more violent and more deadly but shorter and with fewer deaths compared to the overall population. wars became efficient.
all this is to say that if we didn’t have modern weapons there would be more killing - not less. “victory” would necessitate more deaths.