This reasoning doesn't make any sense when you look any closer.

If (and they don't) US had their precious bio-labs in ukraine and that's the only reason for defending it?

Then don't you think that destroying them would come way cheaper then funding a bloody WAR for a year. Do you know how much building a new factories full of labs costs versus a WAR? Do you know what one missile cost? You might not realize that only thing they would need to preserve from those supposed labs is data to build them in anywhere else.

I can't believe i have to say this but this biolab excuse is just total nonsense.