I'm inclined to agree with Cherokee here, though I fear he might not be as open to such restrictions on pins he supports (hopefully I'm wrong).
To make a right-wing comparison, many Members of Congress/state legislators are wearing AR-15 pins to show their support of gun rights. Now such organizations are different because they're not private employers, but the same litmus test applies - would wearing such a pin cause legitimate distress to those I interact with? Just as a Jewish individual might feel threatened by seeing someone wearing the Palestinian flag on a pin, it's reasonable to think that a person who lost a family member to gun violence might feel the same. Honestly, seeing this pin in light of the officers who were gun downed down the road from me this week by this very weapon in Charlotte agitates me just posting this.
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JetBlue is in the customer satisfaction business. While some pax might feel "heard" seeing such a pin, others might feel distressed. Not wearing such a pin would cause neither, and restore the status quo - a pax that doesn't think about it at all who can be pleased/displeased by the service onboard.