Why aren't they naming the killer? It's been days.

There is no question that the assassination of Rabin was a "success". The assassin had a political objective that was met completely and the politicians that were obviously, intentionally inciting violence (in a plausibly deniable way of course) are in control of the government.

https://www.haaretz.com/opinion/2016-11-13/ty-article/editorial-netanyahu-cant-wash-his-hands-of-incitement/0000017f-dbcf-d3a5-af7f-fbefa96d0000