Depends, I think its rather narrow minded of you to assume that a different numerical system, in which 1+1 = pi is unworkable. Who knows - maybe its the solution to being able to quantify circular shapes without rounding (hehe, thats silly as a circular shape is just an abstraction and can never be truely without rounding error by its very definition - but still).
Furthermore, the only good argument you can make against someone killing themselves is that mankind wouldn't really survive with his train of thought - wether you consider it everyones responsibility to contribute to that survival and to what extent or not is just personal bias. No other argument you can possibly make for any sort of behaviour does not negate itself - but usually when discussing truths, we take self-preservance for granted. If we're already going to talk about the abstract that is supposedly the truth, then we'd also have to remove that last bit of unfounded assumption.
And, to top the irony off, that line of thinking has a small benefit in itself : Too often we presume because one way has preserved within reason, there is no other way or other ways are entirely untrue. The least controversial example being a numerical system of your own - any fellow geek here would realize how utterly stupid "1+1 cannot equal 3.14" sounds when I tell them "1+1 = 11", and I doubt they will contest that
We
create truths, because its a tool to perceive and manipulate our reality - we make it a truth that things will fall to the ground, we call it gravity. We expand on that - but its still important to realize its just a method of comprehension, not an un-alterable absolute. Hence yes, truth is entirely bendable :p
Bored yet?
I most certainly have the right to tell you not to kill yourself, don't I? To try and coax you out of self-destructive behavior?
Once we ignore legal systems, as much right as you'd have to kill me yourself. All the right in the world :p