By this logic, suspects *can* and *are* taken into custody every single day in this country. Because the 8th Amendment requires it. And use of excessive force could subject the officer and the police department to a legal challenge later. Or: widespread protests like we're seeing now.
But don't take my word for it:
"Police aren't allowed to use excessive force or treat the arrestee cruelly; this is universal and protected by the U.S. Constitution. Generally, police officers are only allowed to use the minimum amount of force necessary to protect themselves and bring the suspect into police custody. This is why people are advised to never resist an arrest or argue with police, even if they believe the arrest is inappropriate, since resistance could lead to the use of more force. If the arrestee thinks the arrest is unjustified or incorrect, they can always challenge it later with the help of an attorney and, if warranted, bring a civil rights case."
https://criminal.findlaw.com/criminal-procedure/what-procedures-must-the-police-follow-while-making-an-arrest.html
So, officers should either comply with the arrest procedures we're familiar with and that they are already trained on, or:
Roll with what Donald Trump said about "looting and shooting," etc. But he's wrong and indeed no police departments have actually followed his suggestion. Because otherwise we'd be seeing Tiananmen Square-style bloodbaths all across America.