If we're conscious at all after death, I would certainly hope that each of us would be much wiser than we are now, better able to understand the viewpoints of others and to truly empathize.
Even though I find it difficult to hold any *specific* beliefs about the Great Unknown, I manage to maintain an attitude of faith, however vague, and try to proceed as though I'll have to live with the consequences of my decisions forever.
If I had a clearer idea of exactly what to expect, would I behave any better? Maybe, maybe not. I'd still probably screw up at least occasionally, falling into selfishness, inconsideration, or worse...