Interestingly enough, this topic came up a few years back about an incident with someone dressing up as bigfoot.
You can read the article here: SASQUATCH STUNT TAKES A TRAGIC TURN ON HIGHWAY
In case you don't want to read the article, a man dressed in a ghillie suit attempted to start a Bigfoot hoax near Kalispell, Montana. He stepped into traffic and was not seen by two drivers who struck him. The man was pronounced dead at the scene.
My answer to whether or not I'd kill Bigfoot is a definitive "No." My fear would be of mistaken identity. There are too many things in this world that could possibly be mistaken as appearing to be Bigfoot. Sometimes when we are exploring the property we stumble upon wildlife which ranges from elk and deer to bears and the rancher's cattle. Sometimes these animals see us before we see them and we only see a glimpse of them before they are gone. It would be very easy to mistake the rear end of a black bear for a Bigfoot if you caught it out of the corner of your eye. The last thing I would want to see is one of these animals being killed out of season because someone thought it was a "Bigfoot".
Just as in the article, there are also too many stupid people who do things impulsively without thinking about the consequences of their actions. People dress up as Bigfoot to scare others which is very dangerous. Even if Bigfoot was real I would be too concerned about "killing it" and finding out that it was just a person pretending to be Bigfoot. This mistaken identity aspect would prevent me from killing or wanting to kill Bigfoot no matter how much fame and notoriety I would get for doing so.