but collectivization and the 5 Year Plans were necessary
No, they were not. Industrialization was necessary, but what was achieved (i.e. turning the agricultural economy toward industrial development) via bloody collectivization could have been achieved through a simple regime of taxation on agriculture, and the destruction and conflict of collectivization could have been avoided all together. Privately controlled and perhaps to a degree state-supported agriculture would have been more effiecient and could have continued to feed the USSR, instead the USSR became depedent on food imports (and when the price of energy dropped and the price food tripled, the energy exporting USSR was in trouble).
I beleive in a more modern version of Fascism based on the 30's model but without the racial hate as personified by the Nazis. A strong authoritarian government, non- democratic, where human rights are only applied to those who deserve it while degenerates (murderers, rapist, gang members) can be send off to labour camps for the rest of time. Scum get excuted (serial killers, repeat chid rapists, Bermie Madoff types).
Again. There is no overarching fascist economic program, at least it is quite ambiguous and changed radically with the times. Even the National Socialists and Fascists sort of admitted that they don't have a cohorent economic policy. Their program was above all political: military conquest of colonies and lebensraum, and a return to glory, whether in the East (as Germans planned) or in the Mediterranean (as Italians planned).
And you ignore the utter economic and social failures of the fascist regimes. The reason why the Third Reich and the Fascist Italy were so oppressive and aggressive was not because they were so well run and successful, but because they were dismally failing, and needed a path out of their failures, and that was war. Germany and Italy could have been well run economies had social democrats or other reasonable parties come to power.
As for massacring or mistreating what you call "degenerates", there is no social study or anything that supports such treatment as a viable solution. Murderers, major fraudsters, rapists, etc can be all be rehabilitated and should be because it tends to be more affordable and helps to prevent future crime (as children are left with their parents, etc). Prison and containment, in my opinion, should not be used to "punish" people, i.e. to take revenge, but only used to protect the society from these criminals and to protect the criminal from himself. As soon as the criminal becomes less of a threat, he should be released or put into a different treatment regime. In my opinion, any victim who thinks the justice system should be used to take revenge on the wrongdoers needs therapy.