If the Torah permits a soldier fighting enemies of Israel to forceably take a beautiful gentile woman captive & Judaize her (Devarim 21), it definitely allows him to seize the property of those who would murder Israelites. As R.Kahane used to say: "There are nice mitzvos and not so nice mitzvos. The 'nice' mitzvos like Tefillin & Shabbos everyone likes. The 'not so nice' mitzvos, like ruthlessly putting enemies of Israel to death, men, women, children and animals, & seizing their spoils, even the Haredim will rise as one to somehow be mevatel them!