Is it true that there is no absolute morality?

[Mudhammam]

I've seen people say a lot that there is an absolute morality, but it seems to me that there is not. For example, some people say that killing is ultimately wrong, but there can be no reason why one thinks killing is wrong, other than personal desire. Personal desire is not quantifiable, therefor it's an arbitrary measurement of a person's feelings. 

It would seem were it not for this problem, there wouldn't be religion, which tries to solve this problem through dogma, and the imposition of an imaginary creator of whom punishment is inescapable. It would seem to me, that all morality is nothing more than dogmas, whether it be social norms or enforced laws. 

How does one cope with knowing that all morality is arbitrary, and say that one respects morality beyond being blinded by dogmas, or simply appreciating the geometry of such arbitrary systems? on a purely intellectual level. The alternative is, of course, "psychopathy", where the dogmas and appreciation of arbitrary systems is absent.

By cope, I mean cope with the fact that the systems in place are arbitrary, so there's no one system which can ultimately bring about the best of humanity. Without an objective morality, of which one could appeal to every person through reason, there is basically only wars and dogmas that struggle for dominance.

I view morality as rational principles concerned with the practical goods of sentient beings.  Is rationality arbitrary?  No, it is based in axiomatic truths derived from pure reason, or the logical functions of the understanding.  Likewise, I find Kant's use of the categorical imperative useful here -- By action we will our private maxims to be universally valid -- and as we are rational beings, and by extension, ends in ourselves, we determine morality and the imposition of its universal validity, per the Idea of reason.  That said, no particular ethical principle can be discovered apart from experience, even if experience is not itself sufficient for the justification of said principles, found only in reason when applied to ourselves as ends, or rational beings that are intrinsically valuable (since Minds are the only means through which all evaluation finds expression).