No, I don’t think the Yidden could have outgunned the Germans- I didn’t think it through carefully. I was trying to bring some cases where automatic weapons could have otherwise helped innocent people so I chose an example of a government going after its own citizens (the Holocaust) and an invading country going after a specific part of the population (the Jordanian attack on the old city). The point was that these are cases where the oppressors’ couldn’t use air power on their intended targets without killing large numbers of those that they didn’t intend to cause harm to.
Keep in mind though that Yidden weren’t the only targets, the sheet number of civilian victims and that Germany was involved in a full blown war with many allied countries. Had there been a very significant number of heavily armed citizens they may not have had the extra resources at the time to deal with it.