Yes you can. People take minuscule amounts of risk everyday, by driving or even walking. While I agree there's a point where the risk isn't worth it even if the expected value is positive (eg. russian roulette to win a billion dollars), but we're nowhere near that point with 737 Max risk.
And the door either has a goat or a car. But before the event takes place (opening the door), it is perfectly reasonable to do risk analysis with odds and fractional goats.
Chances of dying because you flew on a MAX are still insanely low. Maybe worse than if it was an A320, but the absolute numbers have so many zeros between the decimal point and the value that they're basically the same: 0.