context is everything in public settings. Was it a tired old man on a cane that clearly needed to sit down? clearly it's rude for the couple to at least not scoot over. is the bench super long? there's probably no real beef as long as you're not directly sitting in their personal space.
In this case, these are clips uploaded over a decade ago for one reason or another. Realistically it's the same case-by-case. In general I don't really feel any guilt per se.