A state law signed Feb. 28, 2025, removes gender identity as a protected status from the Iowa Civil Rights Act, leaving transgender people vulnerable to discrimination. The rights of transgender people – those who present gender characteristics that differ from what has historically been expected of someone based on their biological sex traits – are under political attack across the United States. There are now hundreds of anti-trans bills at various points in the legislative process.
But why?
Reasons given usually center on protecting children, protecting cisgender women’s rights in bathrooms and sports competitions, and on removing funding for gender-affirming care. Some efforts appear to stem from fear-driven motives that are not supported by evidence.
Bias against trans people may not always feel like bias. For someone who believes it to be true, saying there can only be biological men who identify as men and biological women who identify as women may feel like a statement of fact. But research shows that gender is a spectrum, separate from biological sex, which is also more complex than the common male-female binary.
We are social psychologists who study and teach about the basic social, cognitive and emotion-based processes people use to make sense of themselves and the world. Research reveals psychological processes that bias people in ways they usually aren’t aware of. These common human tendencies can influence what we think about a particular group, influence how we act toward them, and prompt legislators to pass biased laws.
Root of negative views of transgender people
Social psychology theory and research point to several possible sources of negative views of transgender people.
Part of forming your own identity is defining yourself by the traits that make you unique. To do this, you categorize others as belonging to your group – based on characteristics that matter to you, such as race, age, culture or gender – or not. Psychologists call these categories in-groups and out-groups.
There is a natural human tendency to have inherent negative feelings toward people who aren’t part of your in-group. The bias you might feel against fans of a rival sports team is an example. This tendency may be rooted deep in evolutionary history, when favoring your own safe group over unknown outsiders would have been a survival advantage.
A trans person’s status as transgender may be the most salient thing about them to an observer, overshadowing other characteristics such as their height, race, profession, parental status and so on. As a small minority, transgender people are an out-group from the mainstream – making it likely out-group bias will be directed their way.
Anti-trans feeling may also result from fear that transgender people pose threats to one’s personal or group identity. Gender is part of everyone’s identity. If someone perceives their own gender to be determined by their biological sex, they…
