"There's a reason you separate military and the police. One fights the enemies of the state, the other serves and protects the people. When the military becomes both, then the enemies of the state tend to become the people."
-Commander William Adama, Battlestar Galactica (2004)
I was convinced a long time ago that none of them read a single fucking thing that comes across their desk unless it involves money.
They read the titles of things, form an opinion based on the title, and vote whichever way their party leaders tell them to.
The ones that vote differently I figure either know it won't make a difference, they have some way of benefiting from the opposite outcome, or least likely, they genuinely believe their constituents will receive the greatest benefit from voting another way.
And they make it super obvious with some of the names that they want people to stop reading at the title and don't bother looking any deeper.