Punctuation

Q. What’s the accepted usage when one wants to put both a question mark and an exclamation mark? For instance, “Who could blame him” is clearly a question, but in context becomes more like an exclamation.

A. You can use an exclamation point. Readers will understand: Who could blame him! It’s a rhetorical question in any case, and such questions often take a period rather than a question mark.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]