Air marshals are safer now that the dress code, which required them to wear suits in a day and age when most people do not, has been dropped. Now they can dress like normal people and they will be less likely to stand out and thus be targeted.
This is good for the air marshals. I am glad. My FIL was an air marshal years ago.
It is also good for Americans. When the air marshals are easy to spot, the terrorists can either take them out or get on the next plane. When they aren’t easy to spot, the air marshals will have an easier time doing their job of keeping Americans safe. And it’s much more likely to happen now.