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While the "T" is in LGBT, trans history and needs are distinct from LGB (lesbian, gay, bisexual) issues.

as preferred by the community you are writing about to maintain a respectful tone. For more detailed guidance on respectful communication, the GLAAD Media Reference Guide

The trans community is not a debate. It is a group of people who have always existed across cultures and history. Your job as an ally or student of LGBTQ+ culture is not to "understand why" someone is trans, but to respect that they are and support their right to exist authentically.