Well, 2 wrongs make one right, don't they?!
I wish we'd first fix women's rights and then extend their duties. What the OP does is just egoistically trying to make other groups also suffer.
I don't have intentions to justify an injustice. I'm saying why should we try to make it even harder for a disadvantaged group? It does not help a single German man if women also have to comply to this law.
Fixing women's rights on the other hand gives everybody the benefit of living in a society that is more fair. For me, that's a valuable goal.
"We'll get around to it when some arbitrary measure is met, we promise"
This is the same thing you're criticising - using one injustice to justify another.