I'm not saying there is a disadvantage with the current system, I'm just pointing it out because of that system getting kills can be pretty easy so I don't see the need to try and make it even easier.
The current argument(correct me if I'm wrong) is that by performing suicide it some how makes towering easier, but it doesn't. They are still dying and needing to go and defend, out of the two PKing is easier than towering with the way things are and it seems like you think suicide should be taken away so it just makes it easier for you guys to get kills, which again, is already really easy.
If you really want PK's why don't you just go outside Graal City and PK the mobs there? A lot of people say they prefer towers for the challenge PKing gives, well here it is.
I don't get the last paragraph, the whole complaint here is that you are at these towers to PK and PK alone, if you're at the tower to tower then people using the suicide method shouldn't matter because it doesn't affect your ability to take the tower or not.
I see a lot of PK'ers take advantage of the suicide method as well, it's not just something that the defenders do.
If a towering guild attacks a tower because they actually want to tower and not just PK, then this does not affect them.