I lived next to a "biolab" for a decade. It was a test orchard for apples and grafting techniques.
I like biolabs. They are neat.
The problem with bioweapons are two fold. Opposite sides of the same coin. Either it kills the enemy so quick that it doesn't spread, like when ebola comes out of the jungle and wipes out some poor African village by making them bleed out their ass to death, and goes no further. Or it kills so slowly that it takes your people with it and makes it so that you can't conquer the village because all your logistics and support people are bleeding out their ass to death in a longer time frame.
Like, maybe it made sense back in the early Cold War when East and West both had these massive conscript armies that you could just kill off in blind frontal assaults. But today western troops (and the local civilians and public back home) are too damn valuable to risk trotting across some poisoned landscape. Hence why everyone except third world shitholes like Iraq cashed in their chips.
They just aren't viable weapons for modern warfare. Just use bombs and bullets and missiles. Conventional munitions. It's easier.