Related to outdoor housing in the USA, you are correct that noisy environments, snoopy children or adults, malicious humans and A LONG LIST of predatory beings could attack and harm, injure, kill your rabbits. Along with the parasites, unless Louisiana doesn't have ticks, mites, fleas, roundworm from raccoons, e.c. shed in urine spores from infected species from other wildlife.
I thought it'd be a neat idea to allow our disabled rabbits to nibble grass outdoors in their wheelcart or towel sling, until blood was expelled along with a transparent segment of the tapeworm she had living inside (for several months). A quick trip to the DVM for Panacur allowed her to expel the approx, 12-inch long tapeworm.
Plenty of experiences from rescue groups -plus- Facebook forums, perhaps here as well, regarding shortened lifespan and the stress of outdoor hutches where predatory beings and parasites are.
Search articles will mention the vulnerable rabbits no longer found in their hutches who were stolen by a 2-legged predator or killed by a land or winged predator.
Yes, be careful with gender ID and allowing a male to impregnate his sister or another. Be ready when hormones kick in and your boy will start spraying! Spraying and mounting. Mary Cotter and Amy Sedaris published excellent Howcast videos on Care of a Pet Rabbit.