Question 2.  I’ve never seen crows being aggressive with each other.  I have seen other types squabbling with each other - like Robins.

Q1. Yes the crows seem pretty healthy and spunky in my area. I haven’t noticed foot disease. I’m don’t know about West Nile impact in my area. However my birderfriend told me in his county many crows in his area died out from West Nile and that they have not recovered. He said that grackles seemed to have filled in the gaps the crows left behind.This is second hand info so I don’t directly have evidence of this.

I once noticed a crow walking on one foot due to an injury on his other foot. Now I understand so much more about foot disease in crows.