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I know LAGs who don't tilt and rocks who do.

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I think the point is that as a LAG you 1) make a lot more plays that can put you on tilt (every once in a while, you're going to reraise a CO raiser who has AA) 2) can more easily easily screw up when on tilt because your plays are based on some subjective things that you can lie about ("He's just trying to make a move here."). Weak/tight players play a much more structured game, and are therefore less likely to regret their plays AND have a much easier time suppressing tilt by reverting to their structure.