That is quite alright.
Anyway. Concerning the safety. Well there is an issue with safety for the mechanics. However there is also an issue with safety for the driver when he goes back out. The tyres get a check over and something may be spotted and changed. Again unlikey, but as we are talking unlikely.
Also there these people do do things to the car. They clear the radiators, the change the tyre pressure and wing settings. They may be needed if something is spotted. These things involve a risk, but it may make the difference to winning or losing the race. It is an acceptable risk. More risky things happen in motorsport all the time and they are part of it. The very nature. To want to ban them due to the risk is OTT IMHO.
They do look a bit silly though! Although perhaps not when you consider what they do, what they can do and what they might do.