I don’t disagree with your characterisation, but I do disagree with the idea that it is republicans alone. Unfortunately this has been the way both parties have operated for a long time. The democrats have also done their fair share of abuse of power just in the last 4 years.
The use by Obama of the FBI to investigate his political opponent during a presidential campaign, on a basis of an improbable opposition research report is unprecedented and to say the least, controversial. Imagine the outrage if any republican president had done that.
Not saying this is only the last 4 years. I agree, at least 30 years. But no, it is not the action of a single party.
Was there any indication this was Obama directing the FBI to behave this way, or that this was an established pattern of behavior? There’s a very important difference between a mistake or an error in judgement vs an established pattern of behavior and engagement of illicit behavior by the president himself (as with Trump offering a pardon to Assange to deny ties to Russia in the DNC hack after failing to have Ukraine fallaciously smear Biden).