Do you understand what happened? Who bought the Steele Dossier?
A conservative think tank, and also the DNC.
Who then used it, knowing it to be false and unverifiable yet swearing it was, to obtain a FISA warrant.
Steele himself presented it to the FBI, so it didn't matter if those who bought it did or not. I'm not aware anyone knows any part of it to be false. Neither Steele nor the DNC can obtain a FISA warrant, only law enforcement can.
The FISA court was fraudulently presented with DNC/Hillary Campaign material in order to obtain a warrant so that many Democrat loyalists within the DC federal law enforcement structure (and CIA...) could spy on the Trump campaign, the Trump transition team, and the Trump administration.
You are very confused about how law enforcement works. Anyone can submit anything as evidence, and it is the job of law enforcement to evaluate it and take it from there.
While your question is patronizing, in fact there was very little separation between the DNC and those in the law enforcement arena who were involved.
Of course, it's not that your guy is guilty, it's just that every human being in the world is in a conspiracy against him. That sounds really plausible. If I sound patronizing it's b/c I have to point out you are conflating law enforcement with a political party.
You are presuming to know what Trump's motivations were, and you are ignoring many facts. He was seeking much more than just info on the Bidens' financial enrichment. Were Trump just seeking to gain personally, and had he set up a quid pro quo, and had he actually held back the money, and had the Ukrainians actually done what he asked, and had he then released the money it would indeed have been akin to your simile about stealing from the poor box. What really happened was quite different.
It was different, in that he got caught and couldn't follow through with it. That's how it relates to my example. His motives are as transparent as those of the guy taking money out of the poor box.
But not so Joe Biden's quid pro quo, which by all appearances was related to protecting his son. A full investigation is required of the Bidens, and since it is part and parcel to the allegations against Trump then Congress should fully investigate all of it.
I don't doubt there are Democrats who would do exactly what you're accusing Joe Biden of, and I couldn't tell you if he's the kind who would do it or not. But the evidence says that isn't what happened, and that is what matters, and law enforcement has to work on evidence.