At some point (usually around puberty but not always), we will come to better understand who we are as people and who we're the most attracted to.
And when youths come to realize that they're part of the LGBTQ+ community, it can be a stressful time no matter where they find themselves. After all, it's often pretty hard to gauge how those in our lives will react when we come to them with news like this.
Furthermore, no matter how many cultural strides we see towards LGBTQ+ acceptance, it seems there will always be some people hell-bent on harming those who don't line up with the way they see the world.
For both of these reasons, a simple "safe space" sticker can be a helpful marker for LGBTQ+ individuals. In schools in other public institutions, they can assure potentially vulnerable people that they've found someone who's more likely to understand and support them.
However, one story from Texas shows that the schools themselves don't always see the value in these signs.