Terror tied groups like CAIR? Antifa? Freedom of speech is the foundation of a free society. Without it, a tyrant can wreak havoc unopposed, while his opponents are silenced.
Putting up with being offended is essential in a pluralistic society in which people differ on basic truths. If a group will not bear being offended without resorting to violence, that group will rule unopposed while everyone else lives in fear, while other groups curtail their activities to appease the violent group. This results in the violent group being able to tyrannize the others.
Islamic law forbids criticism of Islam, Quran, Muhammad. If they cannot be criticized, we are in effect accepting Islamic law as overriding the freedom of speech. This would establish Muslims as a protected class and prevent honest discussion of how Islamic jihadists use the texts and teachings of Islam to justify violence and supremacism.