Are you absolutely incapable of doing "evil" all on your own?
Our God given gift of free will gives us the power to have knowledge of good and evil and to choose between the two.
It is evident that the powers of evil tempt us to choose evil.
We are all susceptible to this power.
And we have the freedom to repent when we recognise the evil we may have done.
In the end, it is those who come to love evil who will be barred from the kingdom of heaven.
Those who are able to repent and accept Jesus as their Lord and Saviour will be welcome into the kingdom.
When freed from the temptations of the source of evil, I am quite certain that I will never choose evil.