It is amazing how people will concoct bizarre theories out of thin air in order to support their own agenda .   You people that are on this crusade to blame feral cats for the death of this cougar are really going far out on a limb, in an effort to justify your beliefs.  

The reason why the cougar was wasting away is simple: IT WAS STARVING.  There was insufficient habitat in the wild to support it.  The same thing happens to any wild animal, when their numbers become too great for the environment to support.

Cougars do not normally come into populated areas and get close to man.  They try their best to avoid human contact. This cougar only came to this trailer park out of desperation, due to the fact that it was starving.   And it is common for younger cougars like this one, who have not been able to successfully establish their own territory due to overpopulation, to be the ones doing this.

You don't need any far-out theories to explain what happened here.