Society as a whole may be more tolerant, but that doesn't mean that (1) that increase in tolerance is significant enough or that it equates to acceptance; or (2) that the trans individual's family or others in their environment are tolerant or accepting. A trans person could be living in a very trans-accepting part of the world like San Fransisco, Seattle, or Austin (Texas), but if their own family rejects them, treats them like crap, disowns them, etc., and/or they're being raised in an environment that rejects, belittles, devalues, disrespects, or otherwise treats them like crap (such as being raised in a religion that has horseshit dogma motivating hate against LGBT people), that individual is going to feel terrible depression, self hate, self rejection, and zero self worth. As a result of that depression and self loathing, imposed by people in their immediate surroundings, a transgender individual has much greater likelihood to commit suicide than someone who is surrounded by people who accept them for exactly who they are and affirm the gender they know themselves to be.
Also, while society has increased its tolerance and acceptance of trans individuals, the country as a whole has a LONG way to go in treating them as equals. In most places in the country a transgender person can still be subjected to discrimination in employment, housing, loans/financial matters, medical care, insurance, homeless help, and a ton of other areas because there are no laws prohibiting discrimination on the basis of gender identity or expression.