I would agree with almost everything you have said here and I believe that my comment was based not on the temptation but the outward act of the sin which is really no different than a person who has been born with a natural disposition towards having temper issues. It is not the feeling or temptation to lose your temper it is only sin when you act out. The part I don't agree with however is this concept of a genetic disorder, a mistake or however we want to phrase it. Even if that were true, that doesn't excuse or justify sin. However I believe that the Bible teaches us that are "genetic disorder" is a sinful nature. A desire to sin, a desire to rebel against God and his ways and seeking our own rather than Gods perfect will.
Behold, I was shapen in iniquity; and in sin did my mother conceive me. (Psalms 51:5 KJV)
And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. (John 3:19-20 KJV)
Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. (Galatians 5:19-21 KJV)
I could go on but sin is a part of our life because by birth we are made slaves to sin through our sinful nature, we practice and hide sin in our hearts and act out of the abundance of that heart which the Prophet Jeremiah said that the human heart is deceitfully wicked, and who can know it. It is only through the power of Christ and the finished work of the Cross can man be made slaves unto righteousness and no longer slaves to our sin and the nature of sin and the power of the Devil.