Rosanne Barr and now Samantha Bee, does the punishment fit the crime?

You may have heard that Roseanne Barr made a horrible comment/joke on her Twitter account - this lead to the cancelation of her show, Rosanne.

Then, Samantha Bee made a horrible comment/joke on her show about Ivanka Trump that has prompted an apology, and an advertiser exit (so far).

If Samantha Bee is canceled too, does the punishment fit? Did Rosanne deserve to see her show canceled? Is there (or should there be) a limit to what comedians can say on TV or online?

Note: Typed this out on mobile, so may need corrections later. Edit: Added links, corrections. Edit again, update Bee's details.