Why does Comcast censor my email reporting spam?

I am very diligent about reporting spam.

I look up the sender's domain and the domains that are used for the phishing pages so I do all the work for them.

Often I get a return email from Comcast stating that the email contains 'questionable content' and was not delivered.

I DO NOT APPRECIATE THIS CENSORSHIP.

IT HAS TO STOP.  You have no right to tell me what is and isn't 'questionable'.