- Put yourself in their shoes
- Think of times you’ve been in a similar situation and explain your reaction
- Can the behavior be explained by a more “universal” model than a person-specific one?
- How are they empathizing with you, given they are projecting?
- How are they empathizing with you, given what you know about how they perceive others?
- What successful model have you used to explain similar behavior for similar people?
- Is your conclusion affected by your attitude towards the subject?
Intentions are physical facts about brains. If you care about those particular physical facts, then you can be a consequentialist who cares about intentions.
Often, some of the physical facts that determine whether a certain word applies to a certain situation happen to be physical facts that fall under the heading of "intentions".
It's just... if "intention always matters" when choosing which word to use to describe someone else's actions, you spend an inordinate amount of time not knowing how to describe something while you gather data on the other agent's intentions, data which may not ever be definitive. That seems to rather miss the point of language.