If it makes any difference to anybody, I am a Hindu born in India and raised on stories of gods and rakshasas.
Despite reading many, many entertaining tales on the subject I cannot recall a time where a "blessed crossbow bolt" was used to slay a rakshasa.
In fact, in the time that these legends were penned, bolts let alone the mechanical crossbow were not available in India. Rakshasa's being slain by conventional arrows were, however, far more common.
So, in a nutshell, I am not "offended" that WotC decided to go wtih 10/good and piercing.