I'm trying to be charitable here, so I will ask you to reflect on the reasons why you think protecting replaceable (or even irreplaceable) property is worth extinguishing a human life.
As I said, violence against people is simply not acceptable here. Showing how violence is often the first resort of police rather than a last resort is the entire point of these protests.
In light of your magnanimous question (inquiring after the views of another is called conversation, not charity), here's my rationale as to why one is justified in using lethal force to defend property.
Let's take an extreme case: Say I'm an immigrant from a third-world nation who arrives in America at a young age. I spend my life working to build a successful small business. I pour my blood, sweat, and tears into it. Now, someone comes along, full of "justified anger" and ready to burn it down. By doing this, he is destroying a huge portion of my life. While this is less severe than murder, it's on the same spectrum of evil; one is destroying another's entire life, the other, only part of another's life. Therefore, a man is justified in any amount of force necessary to protect his property.
I'm aware this isn't a common way to view, but I'm happy to answer more questions and defend it further. I don't believe life has any absolute importance over property because property represents a part of another life. While a person represents more life than a thing in most cases, a thief or arsonist forfeits his rights by committing crimes against another.
[0]: https://statutes.capitol.texas.gov/SOTWDocs/PE/htm/PE.9.htm
[1]: https://scholar.google.com/scholar_case?case=316114562717856...
BTW, yes, people do have insurance on their televisions. It's called "homeowners' insurance" or "renters' insurance."
Then, don't cry when you lose your stuff.