Are these people insane?

A few day ago I was driving on I465 (the multilane belt around
Indy). I moved to the rightmost (first) lane to pass a white SUV
with smoked windows doing maybe 60 in the second lane. Note that
the rightmost was the only free lane at that point. Not far ahead of us,
a semi was merging from a on-ramp, so my plan was to pass the SUV (on the right)
and then pass the semi on the left. Well, the ****head in the SUV accelerates,
trying to trap me behind the slowly merging semi and force me to brake
violently. I had to accelarate to 100 mph to get around him! Made
it around the semi with yards to spare. ****, 100 mph on a 55 mph
road, I'd have been arrested if a cop had caught me, but it was that
or slamming in the back of the semi.

Are these SUV people insane? Do they have a wish to die
in a road rage incident?