There's two reasons for this from a psychological stand-point.
The first being past experiences, and things that eventually shaped such opinions. The other is a self-serving bias.
In all honesty, most misanthropists are the latter. They blame others for their failures, and for the lack of success in life. If they're successful, they look at others as ants, and feel above them.
I'm not dead. I'm just gone. Sythe is in the past, as it will be one day for all of you. Thanks for the 6 years. Bye.