Can you break any law if it’s to save someone’s life?

I’ve been thinking about things like justifiable homicide lately and it made me curious. Are there laws that are still illegal if your goal is to save a life? I know there’s things like robbery and drug charges an whatnot but what about breaking into someone’s house to stop a murder? Or stealing a weapon from a store to defend someone being mugged? There’s also traffic crimes too. Can you break speed limits, not stop for police, and break traffic laws if your trying to save someone’s life? I’m mainly thinking about the US since I live there but I’m also curious how other countries handle it.