What type of logical fallacy does this show

Bandwagon. Suggesting that everyone just likes something ignoring the outliers.

i believe it true i guess because you are the one that is writing so you should know what you are putting in your essay.

themselves

an intensive pronoun is a pronoun that ends in self or selves, such as himself, herself, themselves, yourself, ourselves. since band members is a third person plural, the correct intensive pronoun would be themselves. if the band was talked about as a collective noun, itself would be the appropriate intensive pronoun. intensive pronouns are used to add emphasis to the noun it's modifying which is why it directly follows it.