You don't seem to understand the concept of "rights". Being a student doesn't give him the right to remain after he was lawfully ordered to leave.
There are a lot of GEDs here telling us how it is in a police state. Moreover, most don't have a clue the pressures one is under in college since they have never been there.
Lab work is hard and stressing. At least it was for me. I hated it with a passion but knew if I were to pass my class requiring it, I had to get it done. I often found myself waiting to the last minute to get it done.
If this student's lab work was due the next morning, well he is likely going to get an F on his lab work that may result in an F in the course.
Moreover, I don't doubt that some students may forget or misplace their school IDs on a regular basis. Surely there was another method to confirm this student's right to be there, like his student ID number in a data base. If not, then this is proof postive it is time for UCLA to update it's computer data systems for such purposes.
I have a daughter who is married to a soldier. She is constantly misplacing her military ID and/or forgetting her drivers license. And yes, when in college she replaced her student ID several times. And yes, she has been pulled over a number of times without her drivers license. But in the "backwoods" of Georgia, LEOs can pull up her DL on their data base to see that she is a valid licensed driver.
So what's wrong with this picture of primitive resources at UCLA?
Ah, yes....the I'm under unbelievable stress in school defense...
Stop whining, stop believing the earth rotates only because you breathe oxygen and stop crying about stress. No one really cares. If identification is required to access certain services, you carry your ID.
Is that really so difficult to understand?