Well there are limits. You can’t for example protest in my living room or by breaking into the Capitol building. Trespassing can be a form of protest but it’s still illegal.

If they had broken into the offices after violently clashing with police, or if they were ransacking the place, I would be 100% in favor of arresting them - just like the Jan 6 protesters who attacked the Capitol.

Instead, as far as I've seen even from the Daily Wire, these people just walked into the offices of their company's boss (at worst breaking a lock?) and were sitting there without disturbing his papers or breaking his computers or anything violent.

What point are you making? Calling yourself a protester means you can do whatever you want with someone else's property?

They weren't arrested for protesting. They were arrested for trespassing.

They have since been fired too.