When I moved to the desert, I killed every rattlesnake I saw.
Shortly thereafter, I had mice and rats everywhere tearing up everything including my cars.
It was then I decided the rattlers had a job to do, and I upset the balance.
So after that, when I saw one, I would snare it, and take it somewhere away from the house.
Sometime after that, I learned secondhand, that a rattler bite, and a helicopter ride can easily set one back a 1/4 of a million bucks.
I then made another decision.
Screw rattlesnakes.
I definitely wouldn't go out of my way to kill a rattlesnake in the wild...but I wouldn't think twice about killing any venomous snake around my house.
I just killed a bunch of paper wasps in my laundry room. I used to wonder what in the world they were good for...until one day I was in my garden and saw one snatch a caterpillar. So...I normally leave them alone...but they just built their nests in the wrong spot.
There are a few nests in my roof overhang (soffit)on the front porch. But they are about 6' away from my door...so they can stay.
Now...muddabbers....my wife used to freak when she saw one...(they like the laundry room and sunroom...and my sheds...)...anyway...it took a little while for me to convince her, but she eventually got to the point where they could buzz right by her head and she wouldn't even flinch. She would be doing laundry while they were buzzing in and out.
They're a real dilemma for me...I leave them alone....but they tick me off when I find their nasty nests everywhere. And they eat spiders...(or at least put them in their nests for the babies to feed on)...and spiders kill pesky bugs...and again...I like the non poisonous ones. But...there are plenty of spiders around...so...let nature take its course.
I love my lizards and snakes in my backyard. So, by rights....I should be upset to see a roadrunner...but it's not like one comes in my yard every day. So...it's cool when I see one...(even in the wild it's rare for me) but in my driveway was too cool.