Vadim, regarding pathogens, your post made me think of the book, Failures of Imagination written by Michael McCaul, the Chairman of the U.S. House of Representatives Homeland Security Committee. In the book he wrote about numerous different terrorist scenarios, several basically weaponizing immigrants.
The one that really stood out in my mind was women deliberately infecting themselves with a disease (I think it was smallpox but it’s been a while since I read it) and then heading to Disneyworld.
The book is less than $5 used and an interesting read.