All physical acts, statements, interests, hobbies, blah blah blah speak to one's personality, their thought patterns, and therefore their possible actions, if nothing more than odds of them committing a certain act. I find it odd that such things are so heavily restricted in a court of law. As if knowingly admitting that the average juror is incredibly gullible and incapable of logic and reason. At that point, the whole system is worthless.