We'll see. I don't understand why they would need to hide. Joshua isn't close to Trump administration and seems to be pro-Democrat just like Karlie. So them "hiding" because of Trump makes no sense.
As for Kaylor fans, that's all on Swift (and I suspect Karlie too) since Taylor was liking Kaylor posts on tumblr and it exploded from there even into mainstream media. Maybe there was some smoke there, maybe they were just messing around but TS loves to pull that shit in the media. That's the part why she's so successful as a brand.
I still don't think paps follow Karlie, but they're being called where and when she will be present so they take the pics. I highly doubt a pap is camping outside of her house every day to take her photo. It's how industry works, I guess.