I agree, if you want to be left alone, dont go to channel 1.
KSing will occur in both HHG1 and Ant Tunnel...in any channel. Both maps are good for training for sooooo many chars and both have a number of quests that require the drops from the monsters (including the LONG 999 quests).
At HHG1, by its very nature you will be ksed as some point and will ks someone at another, it is unavoidable...now I do have one exception to that, if it is an off hour and there are like maybe 2 or 3 people in the map (including yourself). Then there is no reason anyone should have to be ksing...finding an open spot in that map, or on a channel shouldnt be difficult.
Ant Tunnel room 1, other channels, unless it is a busy time (say 4~7 PM PST or the weekend), I dont think there should be much ksing there since it is such a huge map. The problem with that map is many dont want to kill in the middle section, or they want a particular part of the map and start ksing that spot. One person can not control that huge map, so therefore other people will come and kill there, and unfortunately, some will ks there too.
As for public domain...HHG1 is the only one I can think of atm. Most other places where ksing occurs are because the map is popular, for some reason or another (completing quests, training, good drops/exp, close to a pq spot, etc) or the map is so huge that one or two people can not control it themselves. I believe ksing happens there because the map is popular for whatever reason, and some people think it is ok to ks others and try to steal their spot/map. Pigs Beach, for example, is a huge map and therefore shouldnt have a lot of ksing there since there are soooo many channels and 3~4 people can easily share that map (depending on class and lvl of the chars there), but some people cant share very well.
I think HHG1 is the exception to those maps and is Public Domain because it is the begining spot for all chars, and is popular for higher lvl chars too after they do a job adv because they want to play with their new skills. Too many monsters split up so evenly with straight platforms for the monsters, hay bails and ropes to escape to when needed, and tons of people killing which makes the respawn rate great for training for all platforms in the map. Unless you really dont like strangers or you have a higher lvl friend to help or you really are a noob and dont know about HHG1 yet, everyone starts off there because of those reasons.
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Apparently I know nothing.