Total depravity means they can only do evil...."we are utterly indisposed, disabled, and made opposite to all good, and wholly inclined to all evil, do proceed all actual transgressions".
Calvinists will argue with me that total doesn't really mean total.
What's the context of the above quote? It is speaking of mankind in relation to God, what He deems as good, and that mankind is therefore wholly inclined to evil. And mankind is. In fact man, in his flesh, cannot please God, Roman's 8:7ff.
Jesus said of man, if you, being evil, know how to give good gifts unto your children how much more will your heavenly Father...Matthew 7:11. Note Jesus never said they did good, or are good, but are evil, and that the gifts given are good. One must distinguish these two things.
Are/were you, outside of Christ, a pretty good being? Or is/was your nature, mind, will, emotions corrupt (which is the meaning of total in total depravity).
You've misunderstood and have taken your above quote out of context. In fact, you left off the leading words prior to the portion you quoted, they are: "From this original corruption, whereby we are utterly indisposed..." That, and there are 3 prior points in its context.