Why do Leftists have such a problem with tyrannicide?
must take into account the fact that the Left's ideal of society is one
where the State controls all aspects of human life and where the
refusal to submit to the will of the State is a punishable offense.
Punishments which include the penalty of death.
In short, the Left seeks to establish a state of tyranny.
This may explain why they have a problem with those who practice tyrannicide.