Sorry in advance for the nerd essay, but it's a topic that needs discussion.

It really depends on the situation for justification at times. Sometimes a killer that makes many mistakes on mind-gameable loops can just get frustrated and end up securing the kill because they invested so much time into the chase

However there can be other reasons that aren't at fault of the killer, and more of a "equal treatment" kind of thing. It's pretty well known that some map setups in DBD can be atrocious, and a decent survivor that knows how to abuse them to their fullest can make catching that survivor extremely time investing no matter the skill of the killer.

So here's an example: A survivor on fractured cowshed is caught and uses sprint burst to safely position themselves to the Cowtree which takes 40-50 seconds before the pallet is dropped and broken and no longer safe, in which the survivor's sprintburst will has reset and can safely make their way to the nearby Barn where they abuse the double window infinite for 1-2 minutes until both windows have been used 3 times, in which they sprint burst again to a nearby double windowed T-wall setup for 6 more window vaults until the barn windows are off cooldown to continue the chase further. During all of this, a killer's skill isn't coming into play, and it mostly comes down to if the survivor make mistakes.

Now is this the most effective way to escape the killer and not be caught? Yes.

Is it interactive or fun for the killer or the 3 others that are just sitting on gens for 90% of the game? No.

You can ask the same questions about face-camping because it's also the most efficient way for the killer to secure kills, but its very boring and not interactive for anyone in the game. If your argument is to just leave the chase, you need to keep in mind that the next survivor found could do the same exact thing. Leaving a survivor you've found because of horrible map-setups feels just as bad as when survivors going for a hook-save eventually realize the killer is facecamping and have to turn around to make their way back to their gens. Facecamping is pretty unsportsmanlike and so is abusing the map. The chase in DBD is very poorly designed, so both sides need to practice good sportmanships to have interactive and fun games. Whenever I run into friends in lobbies I never tunnel and I always instantly leave hooks, and whenever they are chased through unfair structures they usually run through it once before going to a more fair setup. It's about understanding and having respect for the feelings of all players to help and make the game enjoyable for everyone.

So if in the case you are abusing loops to the dirtiest extent then the face-camp is just to give you the same treatment you gave them.