Why 'should' atheists be moral?

[Mister Agenda]

The idea of 'should' only makes sense in reference to values and goals, with can only come from two sources: outside the moral agent (objectively) or from within to the moral agent (subjective). Without values and goals that transcend the individual, like the Good or the True, the moral agent must look to their own desires and needs as the source. Now to transcend the individual one need only go up one level to the community. That move doesn't say from where a community gets its values. Appealing to evolution doesn't solve the problem, since it only applies to survival. You need to be able to show that survival is the ultimate source of value to get near anything objective.

You seem to mean 'universal' when you say 'objective'.

adjective: objective

1.
(of a person or their judgment) not influenced by personal feelings or opinions in considering and representing facts.

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This is a similar argument to the above post I just replied to. I agree with you completely it makes life better for everyone but why should someone who is intelligent enough to take advantage of everyone else being moral to each while being immoral himself not do it.

Also your arguments such as not getting thrown in prison are reasons which I noted which we shouldn't take into account as it's exactly moral if this is the only reason you are killing someone.

You mean like God saying it isn't moral or not doing it out of fear of hell aren't valid reasons to be moral?