It isn't celebrating death its a harvest festival.
https://en.wikipedia.org/wiki/Thanksgiving
Its secular, pagan and global and is celebrated inmany ways.Over here we call it a harvest festival. Who told you it was about death and slaughter and why didn't you check your facts?
A kind of American St Patricks day right? Beer and food beats kids going round menacing people for sweets or a corporate shopping day.
Nobodies invited me though.:(