They were a bunch of guys. More accurately, they were a bunch of white guys. Those white guys, and I’ll keep giving them the benefit of the doubt and say they did it with the best of intentions, designed the foundation of a platform that would later collapse under the weight of harassment, abuse, death threats, rape threats, doxxing, and the eventual takeover of the alt-right and their racist idiot pumpkin king.
All the white boys in the room, even with the best of intentions, will only ever know what it’s like to make make decisions as a white boy. They will only ever have the experiences of white boys. This is true of anyone. You will design things that fit within your own experiences. Even those that attempt to look outside their own experiences will only ever know what questions to ask based on that experience. Even those doing good research can only ask questions they think to ask. In short, even the most well-meaning white boys don’t know what they don’t know. That’s before we even deal with the ones that aren’t well-meaning. (I see you, Travis.)
Twitter never built in a way to deal with harassment because none of the people designing it had ever been harassed, so it didn’t come up. Twitter didn’t build in a way to deal with threats because none of the people designing it had ever gotten a death threat. It didn’t come up. Twitter didn’t build in a way to deal with stalking because no one on the team had ever been stalked. It didn’t come up.