They aren't considered that by any normal logical person, but they are considered that by politicians and their crime partners, the Baseball owners.
And YOU might live somewhere that government owns the ball park, but in Chicago, both teams play in parks that are PRIVATELY owned.
The football team here plays in a government owned stadium, which of course is a different philosophical problem.
As to telling you what you are for, I can only go by what you post. You post in favor, you are in favor. It's simple. Saying you don't like something while supporting it is a non starter.
But consider why someone might consider it public use. Certainly city hall is public use. Certainly the expansion of a highway is public use. What about a park? You know, with benches and trees and grass and such. That's public use, right? What about a zoo? They'll probably charge admission. Is that public use? Well, if that's public use, what about a stadium? The city will own it. They'll have public events there. It should be noted that this is a very big reason why stadiums are not more often privately-owned. It's much harder for the private owner to sieze land. So, for those who lament the proliferation of public arenas, there you go.
There are also ways around eminent domain, of course. Offer money, if there are hold-outs, build around them and make the property worthless.
Build the stadium itself on non-eminent domain land and build the public parking on the seized land. The parking can be wholly independent of stadium events.
There's a romantic notion of saving one's precious home (or art gallery, I guess) against the bulldozer, but most of the time, it's just greed. The problem with New London is that they weren't Machiavellian enough. If you're subtle, you can take all the land without anyone putting up a fight.
Oh, and it should be noted, that without eminent domain, in order to get large tracts of contiguous land (for stuff like stadia, not for a big box store), you have to buy things like farms. So, for anyone who laments the dwindling farmland, it's worth keeping in mind.
Every action has a consequence.