I don't know about you, but I expect adults to act like adults and accept the consequences of their actions, not like children who react on raw emotion. They shouldn't require coddling to learn from their mistakes and better themselves. As I stated previously, no one is perfect, but making broad assumptions about those casting aspersions on them won't solve anything either. Ultimately it isn't even the random belligerent person "yelling" at them on the Internet that causes them to face consequences, it is widespread public opinion, or in many cases, such as Carano's, their employer. If a celebrity screws up majorly, there will be many more people silently refusing to buy whatever they're selling than those relative few "yelling" at them. Likewise, your employer reserves the right to terminate you if they feel you've crossed a line, and if an employer is nice enough to give you prior warning and you continue on your current path, you have no one to blame but yourself.
It's sort of ironic that the conversation has gone down this path seeing as how Dr. Seuss is dead and doesn't exactly care whether or not he's "cancelled." In fact, as Tom Morrow mentioned, he later regretted his penchant for creating racist drawings and made books about inclusivity later in life. Who's to say he wouldn't agree with this decision of his own estate that so many people are needlessly up-in-arms over (essentially trying to "cancel" his estate?)