Is there a named psychological condition for people who find every bad thing to be someone's "fault?" Suppose person X is looking for something he has lost. Instead of thinking he left it somewhere, he is convinced that person Y has taken it. X is so convinced of this that he will not even look for the object. Instead, he badgers person Y for the location of said object.

In another example, person X is sitting in the rear of a vehicle. He feels cold. The temperature for the rear of the vehicle is controlled by a panel of buttons immediately in front of X. Instead of changing the temperature, he gets angry at person Z. His first instinct is to assume that person Z changed the temperature so he would be cold.

This behavior almost reminds me of Capgras syndrome. Person X attributes every negative circumstance to the malevolent intent of another individual, usually someone close to him he fears or sees as oppressive. He thinks of most people around him this way, and he sees himself as their victim. X responds this way to everything: lost items, a hamburger served differently than he ordered it, tripping and getting hurt, changes in cellular reception while driving along a freeway, etc. While some of these may be someone's fault, he attributes fault to the wrong person.

Is there a name for this type of behavior?
I thing what you are looking for is scapegoating :


  Scapegoating is the practice of singling out any party for unmerited
  negative treatment or blame as a scapegoat. Scapegoating may be
  conducted by individuals against individuals (e.g. "he did it, not
  me!"), individuals against groups (e.g., "I couldn't see anything
  because of all the tall people"), groups against individuals (e.g.,
  "Jane was the reason our team didn't win"), and groups against groups.
  
  A scapegoat may be an adult, child, sibling, employee, peer, ethnic,
  political or religious group, or country. 
  
  ...
  
  Unwanted thoughts and feelings can be unconsciously projected onto
  another who becomes a scapegoat for one's own problems. This concept
  can be extended to projection by groups. In this case the chosen
  individual, or group, becomes the scapegoat for the group's problems.


Hostile Attribution Bias is another possibility, defined as the tendency to interpret the behaviour of another as having hostile intent even when the behaviour is ambiguous, neutral or benign.

References :


Roy F. Baumeister &amp; Kathleen D. Vohs, 2007, Encyclopedia of Social Psychology
Berkowitz and Green, 1962, the stimulus qualities of the scapegoat, Journal of Abnormal and Social Psychology, 7, 202-207
Gemmill, G., 1998, The dynamics of scapegoating in small groups, Small Group Behavior, 20, 406-418