I think it is safe to categorize Taquinius Priscus, Servius Tullius and Tarquinius Superbus as Etruscan.

Now, the first gets killed by Roman supporters of the sons of Ancus Marcius. The second gets killed by the third, who then proceeds to try capital crimes on his own authority, starts eliminating Senators, puts his son in power at Gabii, the same son who later rapes Lucretia. This was all sweetness and light?