why didn't Garland clear it with Biden (of course, you probably think he did)?
As for me, I have no idea if he cleared it with Biden and I am not concerned with that aspect.
If the whole thing was political, as you and others seem to believe, why didn't Garland clear it with Biden (of course, you probably think he did)?
It is entirely possible, and even probable, that Garland doesn't think his actions are political. He probably thinks he's doing what's best for the country, and that he's executing his position with the integrity that is expected of such a role.
But again, like you, he lives in a different reality than we do. He lives in a reality where Trump only came into office because of Russian interference in the 2016 election. In the reality that he lives in, Trump was never a legitimate President, the dossier stuff was all real, and he could be selling secrets to Russia as we very speak. Even if these aren't his personal views (though they very likely are), there would be internal pressure on him from these views to pressure him to take the action of raiding Trump's home.
It is exceedingly unlikely that these biases did not have a factor in the decision to raid Trump's home.
To your side of reality, these biases are warranted, and justified.
To our side of reality, these biases are ridiculous political hoaxes.
So, whether or not Garland's actions are "political", again... depends on which side of reality you are on.