Again Barry did not become the Flash because of his mother. Never once in any Flash story does it say he became a hero or even a police scientist because of his mother's murder. I mean even in Flashpoint Barry was still a cop meaning he was always going to be a cop regardless.
And minority? That is a bit of a stretch. Hal Jordan, Sue and Johnny Storm, Aquaman (depending on which version), Superman, Iron Man, Captain America, Kyle Rainer, Simon Baz, Kamala Khan, Wally West and more all have typical childhoods with parents. Even most of the X-Men had loving families before their mutations (and some even after). TBH only really Spider-Man and Batman are directly inspired by their guardian's murder to become heroes at least that are well known. At least a good amount became heroes just because and don't even really focus on their families. I'm pretty sure most silver age heroes lacked tragic backstories like Batman or Spider-Man
and no the other speedsters aren't lesser than Barry. Barry didn't know how to time travel unlike Wally and didn't know about the speedforce unlike Max Mercury. He didn't even know how to make his costume unlike Wally