Wow, high sec is actually the most dangerous space in EVE and there is lots and lots of ganking there

As a low sec/null sec player I'm always terrified when I have to transport something valuable in high sec

And the whine of new players that are getting ganked in high sec because they don't fully understand the mechanics there (which is easy, cause they are are really contrived) is unending
But PVP flags are also a bad solution that was used in a lot of "older" games and failed, because of how easy it is to misuse them for nefarious purposes. Other than that - it's just unimmersive. Let's say there is a camped contested station in no-law space - half of the players that undock are attacked and the other half is totally immortal while leaving.
Awkward.
Also - buddies of gankers that have the no-pvp flag on but make you an easy target by blocking and bumping you and stalking you to report your location. Or just annoying trolls.
PVP flags are nothing new in online games, but they are bad, really bad.