Yes, we all have a various moral obligations. Do all of us have a "responsibility" to make the world safe for our most vulnerable individuals? No. A barista will make a hot coffee when asked, knowing it can hurt people who might spill it. A barista does not have a "responsibility" to make only medium-heated coffee. At the same time, there are people in the world who try to make good tradeoffs with regards to coffee temperature (e.g. MacDonalds corporate, or lawmakers setting an upper limit to allowed coffee temp). So at the same time, one person might make an effort to make coffee safe for vulnerable persons, while another person might just have a responsibility to serve coffee at whatever temperature was decided by the other people. Different people can have different responsibilities in the world.