'The suspect broke into the house and killed two people. Police arrested the suspect, John Smith, yesterday." Kinda defeats the purpose of using the term 'suspect', doesn't it?

Yes and No. Languge is fluid and meanings morph.

Gay has meant, over a period of several hundred years, variously sexually active as in "brisk young widow" to happy about life with no sexual connotations, to the modern appropriation.

As Nigel Rees was won't to say in his books: "bad meanings drive out good"

Hung is ambiguous without context (sexual connotations rear up (sic) again), whereas hanged is more specific. And I am hanged if I know why!
I know which I prefer to be!