That would be because the Earth is a dystopian mess currently going through a slow motion apocalypse.
Really, of all the homeworlds shown in universe Earth kinda gets a constant, crappy deal. After the Fog it's implied it was pretty much under the yoke of GENOM along with much of the rest of known space, and after GENOM fell and it was getting cleaned up (still a work in progress 30 years later due to sheer size among other things) it fell under the yoke of a populist dictatorship despite being the capital of the UFP. And unlike many other planets, could not effectively tell the populist dictatorship to fuck off when said dictatorship took over the galactic government.
Really, of all the homeworlds shown in universe Earth kinda gets a constant, crappy deal. After the Fog it's implied it was pretty much under the yoke of GENOM along with much of the rest of known space, and after GENOM fell and it was getting cleaned up (still a work in progress 30 years later due to sheer size among other things) it fell under the yoke of a populist dictatorship despite being the capital of the UFP. And unlike many other planets, could not effectively tell the populist dictatorship to fuck off when said dictatorship took over the galactic government.