His prents have refused to commnt. It is reasonable then to presume they may be already paid off , be awaiting more evidence or be fanatical supporters of Mossad. Sadly suspect the last one might be the most likely. A normal parent who loved their child would have plenty to say at such corruption as investigations are uncovering slowly. This man had information on a conspiracy in Australia which could bring down the Netenyahu 'government'
Bomb-related incident reported in Ra'anana; suspect arrested (Haaretz)
from the article: Source: Israel offered Zygier's family millions in compensation