I'm surprised that these men chose Jewish people as their victims. I read in this thread that there are only 117,000 Jews in Australia, which has about 29 million people total. Did I remember those numbers correctly?
If those numbers are right, that seems to me so few Jewish people in the whole country. I wouldn't think anyone would have anything against them. I guess just the very fact that they are a minority group may be enough for some small-minded, radical types.
Do Muslims as a whole have long-standing differences with Jews in particular, more so than with gentiles? That may be an ignorant question, but I'll admit I'm mostly ignorant regarding that history.
Are the Jewish people in Australia concentrated in this area, or are they more dispersed all across the country?
From the 2011 census
Australia’s total Jewish population was estimated to be 116,967 in 2021 and constituted 0.46% of the national population which stood at 25.4 million people.
Between 2011 and 2021 the Jewish population grew by 1.2% compared with growth of 19% in the
general population.
The size of the enumerated Jewish population in 2021 was 99,956. However, we found that at least 494
Jewish care home residents were missing from the 2021 Census data (see Appendix 4).
Geography
In 2021, the vast majority (94%) of Australia’s Jewish population lived in its capital cities, more than double the national proportion (40%).
84% of Jews lived in either Melbourne (with an estimated 53,373 people) or Sydney (with an estimated 43,738 people).
The most populous Jewish neighbourhood in Australia in 2021 was Caulfield – North in Melbourne with an estimated 10,884 Jewish people or 9% of all Jews in Australia. 49% of the population of Caulfield – North was Jewish. The adjacent area of Caulfield – South was second most populous area with 8,040 Jewish people.
Among the largest Jewish communities in Australia, between 2011 and 2021, growth was strongest in
Bentleigh East (in Melbourne – Inner South) at 12%.
The greatest decline was seen in St. Ives (in North Sydney) down 27
Lots more info in this link