The main issue with the code snippet is this line:
function randomComment_handler($post_id) {
Check out the Codex on add_shortcode() and see if you can find the error.
Spoiler: It should be like this:
function randomComment_handler( $atts, $content = NULL ) {
ps: You should also avoid using extract(), use $atts['post_id'] instead.
Further consider adding the third parameter to the shortcode_atts() function.
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