What protection do the four elements of negligence provide to an educator from being unduly sued and being held liable for a simple mistake that doesn’t cause actual harm to his students?

Liability of educator and school district.

What protection do the four elements of negligence provide to an educator from being unduly sued and being held liable for a simple mistake that doesn’t cause actual harm to his students?

Does the requirement of having to satisfy all four elements provide too little protection to students, in your opinion? Why or Why not?