We see the phrase in a rugby match poster, for example. The phrase means that each member makes effort for the team's victory. My boss (IT department head) asked me if we could use the phrase for the purpose of raising awareness of the risks of cyber attacks. He wants to convey the message that one error may affect all the systems within the company.
Could we use the phrase in a negative sense? if not, what should we say? "One against all"?