You can try explaining all the people who left open because of being attacked, that their losses were due to inexistant risks. That they were playing under a riskless falacy and that they were as safe in open as they will be now in solo. I think there's one thread about it today, precisely.
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You can try explaining that explorer that he is perfectly safe in open mode... Why should he change to solo mode when returning from the void with millions of credits in exploration data, and a 20% canopy integrity? After all, there's no more risk trying to reach Li-Yong's territory in open than it would be in solo, isn't? He only has to avoid the hot-spots (which are marked on the map, right?) and that's all!, Perfectly safe!. What could possibly go wrong?
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Also, explain all those people that losing their ship/cargo was only due to their own incompetence, for not knowing how to pilot their ships, because their human attackers obviously weren't any risk at all, giving how easy is to escape them with some basic maneuvers, and how bad the instancing system works.
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Ah no, open mode is perfectly safe for everyone, and there is no risk at all. That's why I went solo mode, of course. Not because I was/could be attacked in open, no, because it is perfectly safe, just because I don't want to see other players and because I like to bask in my lonelyness... Play my way, sure, no other reasons.
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Ops! what's that noise? DAMMMMMIT!!!, Stranded in the void without fuel again!!!.... GO GO!!! Fuel Rats!! GO!!!!... See? I like to play in open too!
Well, you have demonstrated a working knowledge of sarcasm. To try and explain.... Most of the 'I'm moving out of open' threads have stopped, only to be replaced by 'where is everyone?' threads. When the game released and no one knew better there were many unsuspecting players introduced to what open could entail. Starter systems full of victims have now given way to barren systems. This is the fuel that players use to keep the 'open has more risk' notion running. It has since gone.
The Explorer choosing to be in solo, even just during the return trip is a function of the value of their data. With the prevalence of the 'open has more risk' notion the player just says why take the chance. just because they feel, and act that way, doesn't mean it is so. Behaving like there is more risk, does not mean there is more risk. It's just that a player goes out their way to protect that kind of time investment. Weeks or months of data can be lost to one encounter, why take even a perceived risk?
Poor play, is poor play. That loss could have come from an NPC if the player is 'incompetent'. Heck, you hear more about people loosing their stuff to station issues more than you hear about pirates these days. An incompetent player in open is more at risk entering/exiting the mail slot than in some non-starting system carting fish through any random system.
Evidence of people reacting to a 'perceived risk' does not make the risk real.