I think it was a bad shoot, as they say. Obviously, the decedent did a few things that placed him in jeopardy (anyone knows by now, don't they, that if you try to play games in the middle of an arrest by American law enforcement that you are placing your life in your hands?). Friends described him as the "most non-violent person you would ever meet". This is despite the fact that he was carrying a firearm (which he may well have been legally entitled to do), which is an implement for meting out violence.
American law enforcement is very trigger-happy, so if you are being arrested, resist, and also fail to tell them that you are armed, you are taking an enormous risk. Plus, ICE is an agency that has lowered the bar for entry to allow in many who otherwise would not be allowed in law enforcement. But just because he did things that common sense would suggest are bad ideas does not make it right that he should be gunned down in the street.
If you believe that it is important that the US is able to police its borders and enforce its immigration laws, then it is also important that the agents tasked with doing so act proportionately. You need to account not just for your own judgment about the shooting, but that of the broader public. For agency leadership and senior Trump administration members to go on television and reflexively lie about the circumstances of these shootings, instead of simply letting procedure play out, then it also harms the effort. If such acts turn the public mood overwhelmingly against illegal immigrant removal, then the struggle is lost. Much of the western world is also watching, and many of us are hoping that the US can achieve this in an orderly manner. If it visibly fails, then it makes it more difficult for everyone else to try.