To the extreme...

Looks like the Rwandan government is going what we call "overboard"...

One can surmise that Kagame would have liked to do this for a long time and now he has a pretext to do so. He has never had good relations with France, as the RPF saw France as backing the genocidaire government. He and his ministers are probably legitimately offended (to be mild) at the accusations--if they're not true, they're essentially falsely blaming Kagame/RPF for allowing the genocide to begin (and if they are true then it's certainly an unpleasant reminder of a failed strategy, nonetheless). There is also the colonialist/colonized angle to this (who are they to judge us?). That has some merit.

Even so, to block all state institutions from operating, including the French school and RFI, is quite extreme and certainly shows the poor state of relations that Kagame and the French have had for years. As, of course, does the warrant that sparked off the whole situation.