Your post doesn't address banning political parties, evicting monks, or ambushing men on the street.
Maybe those regions have substantial populations who don't want to be part of Ukraine?
The banned parties are mostly small/not in parliament. The one with seats (10% or so) was led by an Oligarch who fled the country after the war. Some had members who were tabbed to run a puppet government.
Ukraine has banned Pro-Russia political party Opposition Platform, but its MPs still play a decisive role in Parliament
www.opendemocracy.net
The MP's from that party are still in parliament. The ruling party hasnt expelled them because it counts on their votes for some legislation it otherwise couldnt get through. They'll most likely rebrand as a less pro russian party with similar positions.
The banned church is led by the Russian Patriarch who's all in on the invasion. Many parishes/members left before this was announced.
There's also concerned the affiliated monks are spying for Moscow.
Ukrainian authorities are considering banning the Moscow-tied Ukrainian Orthodox Church.
www.politico.eu
"More than 50 priests, at the latest count, are being investigated for collaborating with Russian forces. One of the most notorious is Father Mykola Yevtushenko, who is alleged to have collaborated with the Russians during their savage 33-day occupation of Bucha, offering benedictions to the occupying soldiers and urging his parishioners to welcome the invading forces. Aside from trying to stamp an ecclesiastical imprimatur on the invasion, he also pointed out locals most likely to resist the occupation of Bucha, the suburban town just northwest of Kyiv that has become a byword for war crimes."
"A poll conducted in December by the Kyiv International Institute of Sociology found that 78 percent of Ukrainians believe the government should indeed intervene in the activities of the UOC; 54 percent think the church should be banned outright and 24 percent prefer a softer option of state control and supervision. Just 12 percent think UOC should be left alone."
The Ukranian state has done well in providing essential services in the war. They've improved public trust in government as well as rooting out a lot of Moscow aligned oligarchs and corrupt judges.
This all sounds very Abraham Lincolnish from the Civil War. Jailing pro secessionists, suspending the writ of habeas corpus, etc.
There's always a risk for over reach, but Ukraine's two goals post war are joint the euro zone/getting funds for rebuilding and having security guarantees. Doing that requires an open political system and good will from the Europeans who are going to pick up the lion's share from the economic side. I think that incentive structure will prevent Zelensky from turning the country into a one party state ala Hungary.
Also, most millenials (me included) are pro Ukraine. Young Gen Zers may be different, but foreign policy positions usually evolve as young people grow up.