In these circumstances, this kind of criticism is especially necessary. It's easy to feel like you're doing the right thing and that you're helping people when you set out to hack medical devices. The truth is that you should only even think of doing it as a team with a leadership that understands the full engineering requirements for such a device completely and is very professional about it, including following strict processes (testing separated from development, test documentation, etc...). The consequences of sloppy work in that field can be extreme.

I'm not going to put up with "it helps if it saves lives" as a /blanket/ excuse. It fall apart when it saves some and kills others that could have survived.