I have an intact dog (in fact two, if you count the five month old puppy) and I'm not at all insulted if someone questions me on my choice. I'm glad to discuss it with them. I fully encourage people to spay/castrate their dogs unless they have a specific goal for that dog that requires it to remain intact AND they can manage their intact dog responsibly.
I worked for a vet for six years, saw/assisted in thousands of spays/castrations, and only once did a dog ever die on the table - and that was from a health problem that was in the dog, not from what the vet did. But I DID see many dogs with mammary tumors, prostate problems, testicular cancer, pyometra, etc. And I also saw many bitches with whelping problems and several of those bitches died either during whelping or later from infection. I helped hand-raise puppies from birth. I have NO doubt that when it comes to risk of spay/castration compared to risk from whelping or health problems, there's much less risk from neutering than there is from leaving a dog intact.
That being said, I do have an intact bitch that I'm showing and still considering breeding. That's my choice, she's an exemplary, titled bitch that is only one of six in the U.S. in her breed who have passed all six health clearances. Most of you have already heard all that so I won't go into it again .. *L* .. I fully understand the risks involved in keeping her intact, I manage her so that she doesn't have any opportunity to be bred, and everything is fine. If I choose not to breed her in the next year or so I'll have her spayed so as to avoid pyometra (been through that with one bitch and she was a VERY sick little girl, wouldn't want it to happen again).
Melanie and the gang in Alaska