I think you misunderstand. Many PvEers love combat. I do! I love going to Nav points of combat zones and testing my skills against a variety of NPC pilots. An Elite/Dangerous Cobra/Viper for example will give me a nice challenge, that i will feel some satisfaction from beating. Of course, i don't get any real satisfaction from blowing up a harmless sidewinder... but i'm free to choose my targets or at least choose my exposure to risk.
Now, pay attention class - this is enjoyable for me. Maybe not for you, but for me, yes.
Would i like PvP with other people? Sure! I have no objection. Just as long as i choose that level of risk. Going into open for me is too high a level of risk. Sure, i might beat some players, i might lose, but the most likely scenario is I would be attacked by someone in a better ship than I have with superior flying skills. Hells, even if I get myself a full kitted out python at some point, i'd still probably lose to a majority of players, i'm simply not so skilled.
Also, there is no motivation for me to even do PvP. Or put it this way, let's say player bounties were 1000x higher than NPC ones... i still wouldn't be motivated to do it. I'm not playing this game for money (which is why often suggestions about making trading in open more profitable would encourage PvEers to move to open - the people writing such threads simply fail to understand the motivation of most PvEers).
So, back to PvP - might partake in it, as long as i can control the risk. For example, I might say to one of my friends, let's get two equally kittted out Vipers and have a pop at each other. That could be fun, we might both enjoy it. Even when losing. And neither of us would get upset by the fight.
However, tootling along in a Type-6, getting interdicted and blown up by someone in a Python. Especially by those who give no warning, and no option to drop cargo, just pew-pew. Yeah, but sorry, i'm not interested in that. No fun for me. Since i cannot control the risk of this when playing open (in other words, I have no idea if the player interdicting me is a good RPer who will play the pirate properly and demand cargo and then let me go OR whether they are just someone out to kill me for no reason), then I will not ever set foot in open.
I hope you understand it a little better now.