http://en.wikipedia.org/wiki/Katyusha
Israel captured BM-24 MRLs during the Six-Day War (1967), used them in two battalions during the Yom Kippur War (1973) and the 1982 Lebanon War, and later developed the MAR-240 launcher for the same rockets, based on a Sherman tank chassis. During the 2006 Lebanon War, Hezbollah fired between 3,970 and 4,228 rockets, from light truck-mounts and single-rail man-portable launchers. About 95% of these were 122 mm (4.8 in) Syrian-manufactured Katyusha artillery rockets, which carried warheads up to 30 kg (66 lb) and had a range of up to 30 km (19 mi).[12][13] An estimated 23% of these rockets hit built-up areas, primarily civilian in nature.[14][12][15]
There were incidents reported that BM-21 launchers were used against American forces during 2003 invasion of Iraq. They have also been used in the Afghanistan and Iraq insurgencies. In Iraq, according to Associated Press and Agence France-Presse reports, Katyusha rockets were fired at the Green Zone late March 2008.[16][17]
122’s are not very accurate. Yet, if you fire them at a major city, they will land somewhere. They might hit the road, the outhouse, a school house, your house, or land in the back yard. Tell me if you want them aimed at a major city in the USA? I do not not. Why should Israel have to tolerate them?