Because Tu Beshvat was turned into a holiday by people who were bemoaning how far they were from Eretz Yisrael and thus the mitzvot tluyot ba'aretz. Agriculture - through the actual work of the land - stirs more emotional ties to the land than cattle does.
i'll echo tmaishar; this is how it developed. in gemrany, you could pehaps get some dried fruit from the holy land, say some dried carob, dates, or figs, once a year. meat was nothing special. it's like saying why didn't they drink water on sukkot. well, duh. they drank water every day.
Just one word...PETA! ;)
i've got a new custom! thanks wolf!
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