[Hiddigeigei]

"...U.S. government has in its possession 12-15 “non-human” spacecraft..."
These "non-human" spacecrafts seem to have had a lot of accidents.

[GingisK]

Perhaps some are automated and subject to accidents. Super sophisticated equipment is subject to breakdowns. We can’t even keep our F-35s from augering in on our own planet in our own atmosphere. Why would theirs be perfect following such travel? Also, we might be shooting them down.