Rinsing the kmeta solution renders the sterilization void. If the rinse water is infected, so will your wine be infected.
Kmeta solution is only a sterilizer during WET CONTACT. It won't hurt the wine to have that wet tools amount added to it.
First off, the purpose it not to sterilize, it is to sanitize. There is a huge difference in these two!
Tap water is considered to qualify as sanitized. If you have bad water, such as some untested private water wells, don't rinse. Better still don't even use bad water, period. Get your water from the clean water stations at places like Wal-mart. The private well water I grew up drinking was pretty goo stuff.
I just don't like the continual build up of sulfites, because I can't control that. If one accurately measures one's free SO2 levels, it is a mute point, since one will know exactly what is needed. I now am able to accurately measure the free SO2 level, but I STILL prefer to rinse.
I use a lot of StarSan, which also says it doesn't have to be rinsed. If one doesn't care about the level of such chemicals in one's wine, one could just use StarSan to top off. Yes, that would be pretty stupid, but if one doesn't need to rinse, why not, it is cheaper than wine?!!!!!. How much of a non-rinse solution is too much?
As I try to always mention (but failed to do so in this thread), it is a personal preference. That is just what I choose.