While I haven't ridden a Harley trike to be able to compare the differences between it and my RSV/Hannigan trike, my trike doesn't handle nowhere near like what's been described by those who have ridden the Harleys. It's a very stable machine due to the wide rear axle, longer wheel base, and raked tree. The independent suspension also contributes to as smoother ride.
The only time
I've only experienced "head shake" at slow speeds going over rail old crossings at an angle.
I have ridden a Suzuki Volusia that was triked. No raked tree, solid axle, short narrow wheel base and couldn't wait to get off of it. That trike probably compares with a non raked Harley.
Bottom line is not all trikes are created equally.
As for those folks who lost their lives I grieve for them & their families as I would for any fellow bikers.
Larry