I really hope most of us liberal leaning people did not laugh. Murder is horrific no matter who the victim.
It is counter to the principles we (should ) live. Sure, no need to go pretend to be particularly impacted, or to suddenly try to find the goodness in him.
Besides, most liberal leaning people are also reasonably smart and know such an act only makes things worse for us, even if our side didn't do it.
My first thought was it probably was a MAGA follower who did it, and it turned out to be the case.
If you really need to laugh, laugh at MAGA for killing their own.