This is off-topic, but this is not really that strange. When you remove predators of equal size from an ecosystem, the dominant predator takes over. Then that predator is 'preyed' upon by something much smaller or itself becomes weaker because it isn't constantly challenged by another predator.

Since humans are not really predated upon by anything of equal size, at least not in civilized areas, the main cause of our demise is micropredation by bugs i.e. viruses, drug resistant bacteria etc. And/or our own weakening, viz the recent obesity epidemic, do you think any of these people could outrun or fight a large predator?

Interestingly, this also occurs for other systems. USA doesn't have a large enemy like the USSR anymore, now we get attacked by small terrorist groups, or our own internal problems. Same thing is occurring to Microsoft, it has no equal competitor in the software field, it's therefore attacked by software viruses and anarchic computer nerds that write GNU/Linux.