、。
Just because I'm a wolf, everyone thinks I'm the bad guy.
Literal
I [subject-が] wolf [quotative-だという] reason only [with-で], everyone I [object-を] bad guy [quotative-だと] thinking-am.
A Little Red Riding Hood or similar fairy-tale context. だという marks the reason noun クラウゼ as 'the reason that [I am a wolf].' 誰もかも ('everyone, each and every person') is an emphatic version of 誰も. 悪い奴 ('bad guy') uses 奴 ('guy, fellow') as a rough/casual noun for a person. A plaintive protest against unfair stereotyping.