It's not interfering, it's trying to prevent interference. Even if elements were later found to be true, the whole laptop story looked a lot like Russian disinformation so it's quite reasonable that they would remove evidence of it until it's verified (which it was, after the election). Yes, this may have been effectively interference but it was done in good faith and for the greater good.
It also wasn't an uninformed decision. The FBI contacted Twitter and warned them that the story was false (a sensible guess at the time) and Twitter agreed to block the story.