That's a bunch of PC, NIMBY horse crap, making excuses for your team being named after people that rape, pillage, and steal by definition but being offended by the name Indians. Too funny.
The thing is, though, that "Pirates" is a profession, something what the word describes is entirely elective and, after all these years, is almost as much lore as it is history. Perhaps pirates themselves will tell us through protests whether they take issue with the term? (
) The ethnic makeup of a people is immutable; they are unable to hide or simply choose another identity in order to escape harm or unjust treatment.
The other issue is of power dynamics. Pirates (and I realize is use here is for example) were not disenfranchised, abused, herded off and relocated. Yes, they could be killed and/or jailed but that's because the very essence of their work was illegal. But they were justifiably feared for their ruthless dominance over their opponents - usually lawful sea merchants. As this profession passed from current life to lore, it was a natural moniker for a sportswriter to tag our teams - hyperbolic, but catchy. You'll recall that it was given after our baseball team stole something like ten bases in a game. "Stealing" is literally the statistical category that earned our team that nickname, which over time became official.
"Indians" never enjoyed that sort of power advantage over the groups that came to define and shape American culture. They never have, either, and yet still very much exist as a large segment of our society. They are still real. Going back to its origins, "the word Indians" is wrong simply because the people the caricature references aren't even Indians, the use of which goes back to European explorers' (Columbus? Not sure who) mistaken belief that they have reached India when they had in fact reached the Caribbean. These peoples' subsequent history on this land since the arrival of Europeans has been well documented and does not need to be rehashed here, but it's clear that is has been disgraceful. I don't think anyone honestly disputes that. So the "caricariturization" of them as "Indians," complete with its mocking imagery as warlike savages, is a continuing offense against a real, actual, present-day people. That's the distinction.