Only the Negative

That a great deal of human (and non-human; but for the purposes of this post I will focus on humanity alone) suffering exists is, I think, undeniable.  However, this does not by any means lead to the conclusion that suffering is the default state of humanity.  While it is true that if one looks, one will detect many negative aspects of the human condition, one can also find many positive aspects - but only if one looks for these as well.

Even the claim that the sun will eventually explode and kill all humans does not invalidate this.  Firstly, if people do not automatically accept this statement, there is a possibility that we will be able to develop technology enabling us to move to other solar systems when this even finally occurs, or to create other solutions which mean that the sun's destruction does not necessarily result in the destruction of humanity.  Secondly, even if the sun does eventually explode and kill everyone, that does not mean that everyone is ultimately suffering; according to virtually all belief systems, death does not necessarily (or even probably) equate to suffering.  If one believes in an afterlife, death may even lead to eternal reward; if one does not believe in an afterlife, then death is a neutral state in which no one either suffers or is happy.  Thirdly, even in the exceedingly rare circumstance that one believes death leads to an afterlife of eternal suffering, this does not invalidate the happiness one (hopefully) experienced prior to dying.  Ends are not inherently more significant than beginnings or middles.