  We find that the remnant of supernova (SN) 1987A share some morphological
features with four supernova remnants (SNRs) that have signatures of shaping by
jets, and from that we strengthen the claim that jets played a crucial role in
the explosion of SN 1987A. Some of the morphological features appear also in
planetary nebulae where jets are observed. The clumpy ejecta bring us to
support the claim that the jittering jets explosion mechanism can account for
the structure of the remnant of SN 1987A, i.e., SNR 1987A. We conduct a
preliminary attempt to quantify the fluctuations in the angular momentum of the
mass that is accreted on to the newly born neutron star via an accretion disk
or belt. The accretion disk/belt launches the jets that explode core collapse
supernovae (CCSNe). The relaxation time of the accretion disk/belt is
comparable to the duration of a typical jet-launching episode in the jittering
jets explosion mechanism, and hence the disk/belt has no time to relax. We
suggest that this might explain unequal two opposite jets that later lead to
unequal sides of the elongated structures in SNR of CCSNe. We reiterate our
earlier call for a paradigm shift from neutrino-driven explosion to a
jet-driven explosion of CCSNe.
