I've found throughout my life that context is everything. You haven't mentioned what kind of work you do and where in the site your team has been going (i.e. what sort of risks you might actually be exposed to).
Here's a (possibly) fun anecdote to throw into the mix:
A bit of Background about Yours Truly
I happen to work in software, although I have plenty of experience on the tools in my own time as well. I'm an advocate for wearing safety gear when it makes sense, and always paying the right amount of respect to all kinds of tools and machinery - even some of the seemingly benign ones!
At age 40, I still have all my fingers and toes, both eyes, my lungs work very well, and I haven't had any near-misses with table-saw or planer blades or angle grinders ... yet. I've also never driven a chisel into one of my fingers ... yet.
A Funny Story
In one of my contracts (as a software developer), I was doing some on-site software development at a sugar refinery.
The office of the IT department (where I was working) was about 20 metres (60 feet) inside the fenced off "site", and it was the very first [exterior] door you came to after you signed in at the [outdoor] gate.
There was absolutely nothing dangerous between the gate and the IT office door: all of the machinery, overhead cranes, boilers and whatnot were off in separate buildings further down the path. Nevertheless, site rules said that as soon as you walked through the gate you were required to have hard-hat, safety glasses and high-vis on.
So, along with the two colleagues in that IT department, I dutifully put on the safety gear to walk 20 metres ... and then took it all straight off again once inside the building (about 30 seconds later).
During that 30 second walk I felt confident that, should a passing bird decide to relieve itself while flying directly over me, I would be protected from any unpleasantness (not only was I equipped with hardhat and safety glasses, but the high-vis ought to serve as a warning to any nefarious avian too).
Now, admittedly, there was a paved roadway that crossed this path between the gate and the IT department door, and it might be possible that one day a truck could roll on through, or a front-end loader or something of the like - and then it might be good to have a high-vis vest on**, but truthfully, it all felt just a tiny bit silly.
The Moral of the Story
Anyone in my department, or in one of the admin offices a few doors up, could be rightfully forgiven for thinking the same and getting a bit lax with the full clobber.
In our case, the answer to "why should I wear this crazy getup?" was pretty much "because it's the rules - even if the rules are silly".
Beyond that, the only possible explanation anyone could have given would have been a long winded one about how site risk assessments work and how HR departments (and the companies they work for) are required by law to implement silly procedures to cover their a$$es (ar$es to Australians), and how written standards are designed to leave very little room for "operator discretion", and how any contractor not following the [possibly silly] rules will [almost certainly] lose their contract.
Given that the first comment on this post is something I agree entirely with, I feel I should clarify that I do understand the reasons for the "silly" rules on this particular jobsite - and that is a big part of the reason I put on the silly gear every day I was there.
The rest of the site was filled with some genuinely dangerous stuff (where the safety equipment absolutely made sense).
My point here is not that "safety rules are dumb", it's just that there is often a bigger picture, and - even if the rules are [truly] silly in your particular situation, you'll make everyone else's job around you that much easier if you just shut up and follow those silly rules.
In this particular case, because there were dangerous things in the buildings nearby, and the poor safety officer shouldn't be expected to know where anyone [s]he spots inside the fence at any given moment might be walking to, it's just easier for everyone to wear the damned hat, glasses and vest.
The only practicable option for excluding IT from the PPE rule would have been to move the site fence - and clearly that wasn't going to happen for three people.
Anyway ... hopefully that helps in some small way, and if not, hopefully it was in some small way amusing :) (I'm sure there'd be a Dilbert strip or two in there).
** Personally, I reckon I'd spot a truck or a loader miles away, and I've gone my whole life successfully avoiding death by cars and buses doing much higher speeds on the public roads.
Also, it was a little ironic they hadn't mandated steel-capped boots across the whole site (I think they were only required once you passed through some other part of the site further in). So I guess while there was a risk something might have dropped on my head from out of the sky along that path, my toes were somehow safe?