The whole purpose is to get Webb out there where we can get a better view of the universe than we can on the surface. Not sure how we could put a shield up that wouldn’t itself be very expensive, subject to damage and actually block our view instead of making it better. What kind of shield did you have in mind?
About 3/4 in plexiglass should do. Lol.
A force field shield as shown in all the movies. “Shields Up”
Honestly, how hard can that be? The kooks are just willing green energy into existence without consideration of basic engineering and physics. Jus do the same for the shield. Piece of cake!