I don't deny the increased danger of having a suicide door open while in motion, but I don't see the design giving any special inclination to open one

In hot climates, such as India and South Africa (and I guess parts of the USA at certain times of year), before the introduction of air-conditioning, it was a common practice among those confident of their immortality to drive along with the doors slightly open to create a draught. If the door opened at the leading edge the draught was more effective but you had to hold on to the door. Should the driver decide to accelerate or swing into a nearside bend .....