I'm looking for a noun that means something dangerous, but it is still a necessary danger so you keep using it anyway. For example, a power-tool might be necessary for a mechanic, even though it could kill them. Another example, someone who is on powerful drugs might regret having to take them, but still take them, as the risk of addiction is better than the immense pain. Sentence: "I don't want to use it, but the ___ might be our only/best option."
Not sure, but -
: Absolutely necessary or requisite; that one cannot do without.
I don't want to use it, but the indispensability might be our only/best option.
I don't want to use it, but the necessary evil might be our only/best option.