"Except that the evidence has stood up to scrutiny, which is why we don't think that aliens are responsible. Since the theory 'humans did it' is always more supported (since we know humans can and do do it, and that humans exist, have the opportunity and the motive)."
But there is NO sufficient evidence.
Heresay and eye-witness accounts are ruled out when they are eye-witness accounts of alines or strange lights, but accepted when it's 'doug n' dave' (well Ok maybe not now since I think at least one of them is deceased).
That people CAN is not evidence of anything to do with the origin. It simply shows that there are ways of replicating the result.
Just because I can demonstrate A way of doing something, does not mean that all instances of that 'something' were created in that way.
The fingerprint thing is quite telling, since it IS possible to plant fingerprints in order to incriminate. So by themselves the fingerprints on the murder weapon are not sufficient evidence (in all cases).
I'm sure there are lawyers who have tried that one when that's all the evidence against their clients
Sorry had to go back to the home-world for crop circle making supplies
Evidence that humans exist: Existential arguments aside ... tick. Evidence of crop circle making capability: ... tick, but with reservation. Evidence of resource availability: ... tick. Evidence of pschological motivation: ... tick, but what IS that motivation? Evidence that some H have created CC's: ... tick. All known creators of CC's be H: ... tick.
The above, does indeed, provide a body of evidence to show that some CC's are created by humans.
It cannot be used to project that ALL CC's are, no matter how reasonable that proposition may sound.
So far as the known H-made CC's go there is significant suggestion that the known H-made CC's differ in many observable ways from the unknown-made CC's. That alone suggests that there are other ways to make CC's than those provided by the known HCCM's.
The motivation for the creation of HCC's appears to be a desire to proove that CC's are a prank perpetrated by H's on other H's. This requires that CC's appeared prior to this where the maker is unknown.
Alien existence: There are the statistical arguments ... possible to dispute by changing the assumptions made, but with the expanding number of earth-like planets being identified in this galaxy alone, it does not seem reasonable that H's are the only (nominally) intelligent life.
Travel capabilities: If it is possible to develop technologies capable of interstellar travel, then, in a near infinite universe, someone probably has. Can't proove it one way or the other, despite all the UFO sightings and abduction accounts (lot of weirdos out here ).
Alien Motivation: Doesn't the above phrase sum up a H's capability for figuring out the motivation?
How does a rat view the mazes that they are put into by H experimentors?
How does the biological subject of ANY experiment understand the motivations of the experimentor?
Lack of apparent motivation is NOT negative evidence ... it's an open question.
Evidence of any Alien CCMing: Cyclic reasoning if that's the proposal being investigated, surely?
There are several methods of planting fingerprints, from creating fingertip moulds to extracting them from rubber gloves. The point of mentioning it was to refute the analogy being made.
Have you heard some of the arguments that come out with?
It's more like saying that because I can write a simple set of computerised rules that can cause a spider-web design to be created, that spiders must use the exact same rule-based mechanism to do what they do.