Should the sentence end with "is"?

English as a Second Language English Vocabulary, Grammar and Idioms
1

He was of the opinion that using vulgarities on service staff is uncalled for, no matter what the reason.

Should the sentence end with “is”?

Thanks!

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2

Here is my version.

He felt that it was inappropriate to use vulgarities toward service personnel, regardless of the reason.

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3

He is of the opinion that using vulgarities on service staff is uncalled for, no matter what the reason is.

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