What's the hate against them? In my opinion if you're invading and forcing your way into a world you're gonna get ganked by a lot by coopers. Do you really expect to find a ton of solo players who don't know how to pvp? Put your sign down and if you still get ganked well bad on them.
I'm a frequent invader and deal with gankers all the time. I have no problem with them.
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I kinda find it amusing. The people that forcefully invade other peoples game to ruin their day are now complaining that they are being forcefully brought into another players game to ruin their day when they were in the middle of trying to ruin someone elses. Now I can kinda see where people that don't invade and simply put signs down are coming from, but I'll put money down that most of the ones that do that used to invade rather than summon and now are being punished for their past deeds.