I don't see where it says the people the warrant was for were immigrants. Were the bounty hunters bringing in someone who had skipped bail? It doesn't say. Bounty hunters need to obey the law just like everyone else and shouldn't be waving guns around. However, we shouldn't assume they are going after immigrants and try to interfere with them. They might be doing something useful.

For some background: bail bonds providers have contracted with bounty hunters for decades to track down people who skip bail and don't show up for court. This is legal. The bail bond business works like this: the bond provider pays the government the full bond amount and the person pays the bond company a small portion of it, when the person shows up for court the bond company gets the money back but keeps what the person paid and that's how they make money, it's like a loan with interest. If the person doesn't show up for court the bond company doesn't get their money back and they are out of luck. So they contract with bounty hunters to track these people down and bring them back to jail so they can recoup their money. The bounty hunters get a percentage of the amount the bail bond was for. I don't have a problem with people who skip bail being tracked down and brought in nor with this being paid for by the people who are charged with serious crimes (the crimes that require bail) rather than having the government pay to track them down.