Why AS security is checked for performing RRC Connection Reestablishment Procedure?

Question

Why in rrc reestablishment there is a need to check AS security is activated or not?

Answer 1

Don't have much insight about this, but what is found is, The connection re-establishment succeeds only if the concerned cell is prepared i.e. has a valid UE context. In case E-UTRAN accepts the re-establishment, SRB1 operation resumes while the operation of other radio bearers remains suspended. If AS security has not been activated, the UE doesn’t initiate this procedure, instead, it moves to RRC_IDLE directly