No, honestly I don't, but you are certainly free to think otherwise
That all instances of evil must be logically necessary to bring about some greater good is a conclusion, I believe, that follows from the basic nature of the theist deity. If the deity could bring about a desired good while permitting even just a little less evil, then He would, because He is perfectly good. And it seems like He would have a lot of leeway to do so, since He is also all powerful.
Why? Especially when we consider that the mind and thought processes of such a being might very be (and in all likelihood are) unknown to us, and also much more complex and possibly oriented towards goals we cannot fathom - why not permit the possibility of more evil?
Also, how do we know that the sum total of evil in the world today isn't a "little less" as it is? We presume that there could be a "little less" evil, but how do we know that God hasn't already beaten us to that particular punch? Especially as, again, God's mind is most likely far beyond ours, how can we be so certain that He hasn't already seen to that? It would therefore be presumptuous to assume that God doesn't exist on those grounds.
And not all evil is the result of human choices, nor is all evil actually known to humans and therefore provides no opportunity for individuals to respond in productive ways. Natural evil, like the suffering of non-human creatures, arguably has been the most plentiful type of evil throughout the history of the world, and there really isn't anything to be done about it. Humans weren't even around to "respond productively" to the unimaginably plentiful instances of it.
I agree, but whenever people speak of evil in the world, only the evil that affects humans is considered. That sort of evil, particularly that which results from our own actions (ie, malice), is what we can control.
As for evil in the non-human world, why is any of that "evil" to begin with? Sure, it might very well be evil and, especially if the account of Genesis is true and evil only entered into the world after the First Sin, even the evils and sufferings of the non-human world might be a result of that. But, what if it is not? What if those things which we observe in the non-human world and you are labeling "evil" are, ultimately, not evil at all, but rather how the non-human world was designed and intended to function? Beauty is in the eye of the beholder, and it might seem evil when one animal devours another - but is it actually "evil"?
Especially when we consider that when we speak of "evil" we normally imply
malice, it would be difficult to prove that any animal acts out of malice towards another. If indeed they cannot do so, then the "problem of evil" shrinks by orders of magnitude.
Ah, but I haven't concluded that the existence of the theist deity is impossible. My conclusion is that the theistic deity is unlikely to exist. Believe it or not, I do make room for the possibility that the responses you have given (and others have given) are true, but I weigh them against other possibilities. The myriad of responses to the problem of evil can make for some interesting thinking, but needless to say, I am unpersuaded by them. I remain convinced that the world would look far different and contain much less evil, had it been created by the theistic deity. Note I am not saying that it wouldn't contain any evil, just less.
Again, why? Why would it contain "less" evil? How do we know that it already doesn't?
Especially if we consider that God might have guided suitable human minds throughout history along a path of moral refinement and has inspired many religions and philosophies for the overall edification of the human masses, how do we know that such isn't the method (or one of them) by which He sees to it that there is "less evil" in the cosmos?
Humans aren't perfectly good, nor are all the happenings in this world under our direct providence, so its not so strange that so much evil is permitted by us. Most of it isnt even under our control. Its certainly unfortunate, but its not strange or surprising.
Actual evil, or malice, is a different thing, I believe, than that which the non-human world experiences. Thus, it is indeed incumbent upon us to take responsibility for own actions, always bear in mind that God has equipped us to refuse to do evil (ie, malice) towards one another, and therefore that actual evil is indeed our own responsibility. The fact that nature is a harsh place or that non-human creatures must devour, displace, or destroy each other in order to survive might be the result of sin entering the world, or might instead simply be how the non-human world was designed to function.