1) The perspective of "I have nothing to hide, I have no issue sharing all my data with FaceBook" has been very prevalent for a long time, as the consequences of that happening on a large scale are not obvious at a glance. It's a nuanced topic with too many variables. It takes a large enough event that can be (correctly or not) attributed to this in order to gain peoples attention. Foreign adversary potentially using this information and tooling to influence domestic elections is a large enough event to result in that coming to the public eye.
2) Facebook, Messenger and WhatsApp all have "Always" permissions options for Location Services on iOS. Instagram has "While using" or "Never" only. Wouldn't expect this to be substantially different on Android.
1) It's irrational. Facebook as an advertising platform is likely much more effective than what you will gain by crunching the limited data collected through apps. Googles advertising platform has other data points than Facebook but is equally potent in targeted marketing. However the biggest irrational hypocrisy in this shitstorm is that TV ads has always been known to be very effective in influencing elections yet no one has tweeted #deletetv.
2) Since Facebook, Messenger and WhatsApp are all 3rd party apps on Apple's platform, you just proved my point. Though I'm not sure you intented to?
2) Facebook, Messenger and WhatsApp all have "Always" permissions options for Location Services on iOS. Instagram has "While using" or "Never" only. Wouldn't expect this to be substantially different on Android.