Unfortunately, that's true. But people get hung up on details that seem not to matter, like why or how it's happening. Science, statistics and objective data aside, let's assume it isn't caused by man. So what? There have been five mass extinctions on this earth. Periods during which the vast, vast majority of dominant and non-dominant species alike were exterminated. This is our future. It will happen, unless of course a virus hits first. I'd stop arguing about what and why and figure out how to mitigate it.
Incidentally, if we accept that it IS being accelerated by man, it's good news. It means we can affect it.