If I stun a tank, how exactlyare they getting taunt? They are stunned, in other words, not alert in order to taunt. This goes for ST but most notably GK. Stunned characters getting taunt is a mechanic and design oversight I believe.
I get what you're saying logic-wise, but unfortunately it's "working as intended" from the developers point of view. Stun only prevents them taking their action. If their taunt requires an actual ability selection then yes, it's blocked by stun as they are losing a turn. But many characters' stuns are based on passive events/triggers. Those occur regardless of whether they're stunned.
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Just to clarify, that's when an enemy scores a critical hit against one of your team (excluding GK), not when one of your team scores a crit.