Yes, but what does that have to do with Google's reliability? What does it have to do with routing issues between one particular site and Google?

He's not claiming that Google is infallible. I'm more confident in their ability to maintain availability than yours. All of this paranoia about Google going down is mostly FUD.

Well, depending on multiple sites for critical data of course multiplies the risk of failure. But the risk of depending on one other highly reliable site for something that should almost always be cached anyway is indeed very very small.

I wouldn't say this whole issue is FUD though. For instance I would not want to depend on four different even high quality third party sites for each request to my website because the likelyhood of failure would be (almost) five times as high.

You missed the point, which was that your site could be up, and google would be down, which would cause big problems with javascript errors.

OTOH if your site is down, it's fully down - no partial content, and javascript errors.

I understand your point and I'm dismissing it as FUD because you're playing the "what if" game. Comeback with some uptime graphs. I don't believe it's worthwhile to worry about Google's uptime and it's perfectly legitimate to let them host jQuery for you until proven otherwise.