It always comes down to the opinions of those who have never seen one. For them, it is easier to dismiss such reports.
For those who have stood face to face with them, the probability that they occasionally get shot and killed is no more remarkable than the thought that humans occasionally get shot and killed in the woods.
As for remains, the fear of prosecution for possibly having killed a type of human is real, in my opinion; the fear of a second one killing you or hunting you down if you try to collect the remains is real, in my opinion; the simple logistics of recovery is daunting, particularly if there's a possibility of imminent reprisal; and the possibility that someone from the government might come along and confiscate the remains also cannot be dismissed (I still cannot fathom that our government is unaware of them).
Beyond that, I am inclined to dismiss any given story about someone having a trophy bigfoot in their den somewhere, but wouldn't be overly surprised if one turned up someday in an estate sale.