Sure, spammers are evil. Spam is annoying. Spam in comments included.
But captchas do not block spammers, they block legitimate people! It is unforgivable and discriminatory—not to mention illegal—to deny access to people. Even to avoid spam. I don’t think that counts as unjustifiable hardship.
Shame on you, Blogger, for the “word verification” feature. Spam is a problem, true, but this is not the solution.