In death note, at one point in the conversation there is this line:

> 誰をキラだと疑おうと勝手だが、あの面は自分だけ助かろうという気持ちの現れじゃないか。

The speaker is trying to tell the other guy that he doesn't care who he
suspects, but he wants him to take the mask off, since it's just to protect
himself only anyways.

What I thought is that perhaps my subtitles are wrong and it's supposed to be
買って being used as "accept", but I checked 2 subtitles and both used 勝手. How
does 勝手 mean "I don't care"?
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2022-09-13T20:05:16.777
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2022-09-15T05:38:48.957
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How is 勝手 being used here?