Would they?
Yes. Take Tibberton crossing in Worcestershire, which has (broadly) the same level of risk as Dalwhinnie. It has an FWI (Fatalaities and Weighted Injuries index) of 0.000106, which is the equivalent of one fatality every 9,400 years, or 1 injury every 94 years. Dalwhinnie will be of the same order of magnitude.
Of course, at any one crossing, the risk is relatively small. But there are a lot of crossings and the risks add up on a network wide basis; on the network as a whole the risk is 12 fatalities a year IIRC. Note this doesn’t just apply to pedestrians and in motor vehicles, but also the risk to those on board the trains. Note also that this number is falling, despite increased road and rail traffic (pre Covid), because of NRs Level Crossing safety programme.
Final point, whilst the risk of a fatality at Tibberton is 1 in 9,400 years, that one year come around in 2019.