Everyone makes mistakes and part of a competitive game is taking advantage of the other persons mistakes.
I agree with this. The only thing I would note is that (for me personally) I don't feel forgetting an action or pilot ability is something I want to take advantage of. If it were a video game or had a referee who could watch the whole game from start to finish, these wouldn't happen, so I'll usually remind people. I like to win because I outflew or built a better list, not on memory errors. However, maneuvering errors, action errors, or target choice errors, I'll let you make those all day.
That being said, in a tournament, go right ahead and take advantage of any error. Not only is your opponent not obligated to assist you, the rulebook is pretty clear on the missed opportunity rules.
Honestly during tournament games I am too busy with not forgetting my own pilots and cards abilities and keeping in mind my right (sequence of) action choices that I cannot keep up reminding also my opponent of his stuff if she forgets something or mixes up his/her sequence.
This is too much a luxury one would expect me to offer.
Edited by John Tenzer