I've just received a reply to a ticket created about bots and co-op - I queried bots endlessly ramming each other.
Response was " Sometimes bots can behave strangely, but they try to imitate the actions of players"

One thing I have noticed (and also queried) was the number of times I end up hitting "friendly" bots recently. You aim at red but end up hitting green far more. Has anyone else noticed this?