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The odd thing here is that you play dwarf fortress and think that having a stadium is odd.
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I built one before knowing it was common but assumed it was common as it's quite a dwarfish thing.
I think i need to see a psychiatrist about this.
Three things;
You likely don't need a shrink. (Not actual advice.)
Making an arena or whatever is common. How else is it best to test how things die how? (e.g. Does my Ultimate Fire Sword of Annoyance really hurt that Electrically Charged Book of Bitchslapping. [Insert whatever game terms you need.] {I play none of the games where super-ultra-mega Japanese sounding weaps are available, so I just threw that all in there. And I LOVE Japan, so just deal with super-ultra-mega.}
The designing and executing of things to kill other things is not exclusive to dorfs. Nor are over-complicated ways to do said same. As far as I can tell, though, designing over-complicated things to be used to kill things while pondering whether you need a shrink or more advice from the forum that contains - well, us - might be reason for a shrink - and it makes you as dorfy as can be unless you have a BEARD (not beard.) (I did tell you that the above was not advice. I chose to change my mind.)
Well, that's my 2/100 Urists.