Could Germany justify rearming?

In light of recent events, could Germany justify rearming itself? They are the 4th largest economy in the world (dwarfed by US and China of course)and they are the predominant power in the EU, so just throwing this out there, not trying to start a conspiracy theory or anything either but it's something I've been wondering. I know there are treaties out there but what if they could be nullified?

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ArishMell · 70-79, M

What was then Federal Republic of Germany ("West Germany") re-armed herself and became a NATO member not very long after the Allies handed back power to her after the Second World War; as Western Europe generally faced up to the harsh reality of the USSR's empire and ambitions.

So the re-united, post-Cold War Germany is not re-arming now, even if strengthening what she has.