Violence has got worst over the years. Or Violence has gotten worst over the years.

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    Are you speaking American English or British English? – Peter Shor Nov 16 '15 at 1:01

Gotten is the past participle of to get, so to form the present perfect (the tense you are forming with has _) you would use it. Alternatively "Violence got worse over the years" would be correct, making it plain old past tense instead.

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