Why are *all* Muggles so tolerant of their wizard children?

[PAGAN MICHELLE I]

No: HPFGUIDX 47292

One thing I've never been able to understand about this entire world
dreamed up by JKR...the WW goes to such lengths to hide themselves, and
yet, wizards can be born to all-muggle families (i.e. Hermione Granger).
Now while her parents were apparently just fine with her being a witch
(just like Lily's parents were *so* happy -- SS/PS), aren't there ever
people like the Durselys, who, if they had a son (their own blood, as
opposed to their nephew) who was a witch, would completely go beserk and
hate him forever, then make it their life's work to inform the world of
these nutters?

Granted, people might think they were insane (much like those who talk
about UFO sightings), but for every one of those like the Durselys who are
afraid of what people would think of them, I'd bet there are people who
don't care and who are so intolerant that they'd find a way to inform the
general public...perhaps with proof like the invite letter to Hogwarts?

I just can't believe that every Muggle with a wizard child is tolerant and
even happy about it.

Polaris