Comma After That Is Why

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    That is why looks like a conjunctive adverb or an introductory phrase that must always be followed by a comma, but it is not.

    Here is the full list of conjunctive adverbs provided by the YourDictionary online reference:

    Conjunctive Adverbs

    accordingly

    additionally

    also

    anyway

    besides

    certainly

    comparatively

    consequently

    conversely

    elsewhere

    equally

    finally

    further

    furthermore

    hence

    henceforth

    however

    in addition

    in comparison

    in contrast

    incidentally

    indeed

    instead

    likewise

    meanwhile

    moreover

    namely

    nevertheless

    next

    nonetheless

    now

    otherwise

    rather

    similarly

    still

    subsequently

    then

    thereafter

    therefore

    thus

    undoubtedly

    yet