logical fallacy

Two Wrongs Make a Right is a fallacy in which a person "justifies" an action against a person by asserting that the person would do the same thing to him/her, when the action is not necessary to prevent B from doing X to A. This fallacy has the following pattern of "reasoning":

1. It is claimed that person B would do X to person A.
2. It is acceptable for person A to do X to person B (when A's doing X to B is not necessary to prevent B from doing X to A).

This sort of "reasoning" is fallacious because an action that is wrong is wrong even if another person would also do it.

It should be noted that it can be the case that it is not wrong for A to do X to B if X is done to prevent B from doing X to A or if X is done in justified retribution. For example, if Sally is running in the park and Biff tries to attack her, Sally would eb jsutified in attacking Biff to defend herself. As another example, if country A is planning to invade country B in order to enslave the people, then country B would be justified in launching a pre-emptive strike to prevent the invasion.
Examples of Two Wrongs Make a Right

1. Bill has borrowed Jane's expensive pen, but found he didn't return it. He tell's himself that it is okay to keep it, since she would have taken his.
2. Jane: "Did you hear about those terrorists killing those poor people? That sort of killing is just wrong."
   

The Straw Man fallacy is committed when a person simply ignores a person's actual position and substitutes a distorted, exaggerated or misrepresented version of that position. This sort of "reasoning" has the following pattern:

1. Person A has position X.
2. Person B presents position Y (which is a distorted version of X).
3. Person B attacks position Y.
4. Therefore X is false/incorrect/flawed.

This sort of "reasoning" is fallacious because attacking a distorted version of a position simply does not constitute an attack on the position itself. One might as well expect an attack on a poor drawing of a person to hurt the person.
Examples of Straw Man

1. Prof. Jones: "The university just cut our yearly budget by $10,000."
   Prof. Smith: "What are we going to do?"
   Prof. Brown: "I think we should eliminate one of the teaching assistant positions. That would take care of it."
   Prof. Jones: "We could reduce our scheduled raises instead."
   Prof. Brown: " I can't understand why you want to bleed us dry like that, Jones."
2. "Senator Jones says that we should not fund the attack submarine program. I disagree entirely. I can't understand why he wants to leave us defenseless like that."
3. Bill and Jill are arguing about cleaning out their closets:
   Jill: "We should clean out the closets. They are getting a bit messy."