I agree 100% it's definitely not the content of the monument, but the perceived state sponsored "nod" to the Judeo-Christian faiths
Doesn't that become a bit petty? The whole church vs state / atheist vs christian / whatever gets a little tiresome. Has society really gotten to the point that we're essentially saying: "I don't want that to be there because I think you're being petty and rubbing my nose in it, so I'll be petty too and either get it taken down or add something you don't like, just because you won't like it".
I think of a Penn Jillette / Glenn Beck discussion about separation. Jillette thought no religious organizations should be able to use public property because people not associated with that organization had to pay for it too. I think the opposite is the case. All members of the public should be able to use that property, since the public paid for it.