I read this at work and was going to comment but got too busy (imagine that--a government worker having to work on government time
).
I wouldn't take any of those statements as fact, and have some disagreement as opinions. The safety claim, for starters, certainly isn't open and shut. I don't know about where you live but around here, despite the economy and fuel prices, the Ford Heavy Duty and its like are still king of the road. I don't know how safe I would feel with my vision limited by being so low to the ground. Braking I don't know about--it's possible that trikes have an advantage there. But I just don't think it's a given that they are safer.
As JanMM alluded to, there are some real comfortable two-wheel recumbents out there. And there are some FAST, comfortable bikes as well. You can ride a long way on a fast, comfortable bike.
The last point I'll give you--they sure look like they would be a blast to ride.