FFS! How are you going to rape anyone sitting at ground level? The mechanics don't work son…
Car seats thrown out all the time - probably just used as a chair.
Texans have seen lots of this - it looks pure coyote to me. Anything cast off used to make a camp; stolen tarps for roof, 5 gal bucket for a shitter - all common for coyotes. If someone dies when running with a coyote, they get buried if it is easy to dig and somebody cares - otherwise they get shoved behind scrub for the buzzards.
You don't run away from a coyote - they do not let that happen because they usually get paid at both ends. They don't want to be ratted out - temptation to run exists once that border is behind you.
Unless there is something much more nefarious turned up, this looks coyote.