Dear {Entity},
I wanted to let you know as soon as I realized this is the case: I will be unable to attend {event}.
After reflecting on the {political, ethical, etc. stance and actions} of the {company/organization}, it became clear that their entire structure and philosophy is at odds with my personal values.
This is not something I can set aside. I feel strongly about {human rights issue} due to {factors}. Most egregious is the fact that {action of entity}.
I appreciate your understanding that I cannot in good conscience support {Entity} in any way.
Sincerely,
{Name}
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Index of letter of apology templates