Is getting passed a violation of your civil rights, er sumthin'?
Just kidding. But you're on a single-cylinder, 196cc motorcycle, so some adjustment in riding style will be in order. Out on the slab you'll have to content yourself with passing them at the gas stations rather than keeping up with them on the road.
First of all the TW's speedometer is usually a bit optimistic. I doubt you were even doing 65. But at 65 you've got nothing left to get you out of trouble.
The motors can take it. Ronnydog and I did a thousand mile "all slab" Iron Butt on them. 22 continuous hours between 60 and 65mph. Plenty have toured on them. But I think anyone whose done any serious TW road miles will tell you to relax, maintain reasonable speed, stay out of their way and enjoy the ride. Trying to squeeze 5 more mph out of a stock TW will mean compromises you may not want to live with.