If you doubt that fact, there's no sense in shaking your fist in defiance. Empower yourself by getting informed. Do a quick search on Google Books, for example. I managed to locate this important quote from Harvard Studies in Classical Philology, p.192:
- "I admit that -ke or -χe in the Raetic tinaχe, θinaχe, θinake is probably identical with the Etruscan preterite ending -ce, -χe, but not in φeχe, where Kretschmer and others agree that we have a proper name [...]"
There's even more to read here in Reallexikon der germanischen Altertumskunde (2001), p.365:
- "Names, I-formulations, and invocations are early textual forms in Etruscan, but also in related, textually more primitive, languages such as Rhaetic. Helmut Rix has found and defined structures similar in Etruscan and in Rhaetic namely expressions in which words in an oblique case defined by him as the perternitive case, on -ale or -si, are linked to a word with a predicate form ending in -ku. Rix defines the latter as perfect-like passive verbal nouns building upon an active form on -ke, thus zina-ke 'has produced' and zina-k-u 'is produced'. Rix, therefore, can point to a complete formal agreement between Etruscan: mi zinaku Larθuza-le Kuleniie-si - 'I (am) produced by Larthuza Kulenie', and Rhaetic: Lasp-si elu-ku Pitam-nu-ale - '(am/is) dedicated by Laspa, the son of Pitame'. The similarities between Etruscan and Rhaetic are essential while, among others, the Rhaetic alphabets are possible sources of inspiration for the runes inasmuch as Rhaetic inscriptions are known from the beginning of our era." (Bolded emphasis of select points are mine.)" 
Those who wish to deconstruct all this evidence of an Etrusco-Rhaetic relationship as 'coincidence' need to address these above facts and references with something more substantial than existentialist philosophy, extremist skepticism or personal feelings.
 On Wikipedia, the term "original research" is misused and in orwellian fashion warped into a pejorative meaning, conveying "unreliability", as if to say that books or Wikipedia itself is 100% reliable. And how then do Wikipedians define their supposedly more appealing "unoriginal research"? Obviously if original research is unreliable (unless published by traditional means), then say goodbye to science and progress as we know it and say hello to Dilbert-like bureaucracy. Reject dogmatic digimaoism and strengthen your individual self-sufficiency.
 The term 'I-formulation' refers to phrases in classical inscriptions consisting of "I am the [votive object] of [deceased recipient]", such as those using 1ps pronoun mi in Etruscan or those in Faliscan with 1ps pronoun eco. To add to the Rhaetic example presented by Rix, the term eluku is directly related to the Etruscan passive aliqu "given" (from TLE 27) formed from the verb al which is fully attested in a myriad of other well-understood grammatical inflections: al-c [LL 8.xxiii] (inf.) // ale [LL 7.iv; TLE 615] (pret.) // alike [TLE 26], alice [TLE 295], alce [TLE 777] (perf.pret.) . Since the meaning is grammatically correct and semantically apt in the context of the Rhaetic inscription above, we have yet further ironclad proof of genetic affiliation between the two languages.