No...I think everything that can possibly be done will be done to keep all the athletes safe. Also, the US athletes will have extra security provided by the US government.
It simply comes down to each individual making their own decision as to go or not. Those who don't want to go won't and those who do will. I heard some US b-ball players are pulling out because of security concerns and that's fine.
This has freed-up spots for those athletes that wish to compete.
For many athletes this is the pinnacle of their career's, the ultimate.
The majority wants things to be safe and I'm sure no country would send their teams unless they felt that things were safe.
At the same time, their can be no certainties, no garuntees.
I'll never forget hearing a couple of days before Atlanta and security official
on CNN say that nothing could go wrong and at that moment I though "how much do you want to bet something will". All everybody can do is their best and if it isn't up to a countries satisfaction then they'll act accordingly.
As for the celebrating thing, I say anyone should celebrate and wave their flags! Unfortunately, this is just another instance of people being made to feel fear, caution, or what have you because of something their government has done, wheather agreed with or not.
All that being said, I definitely think the US Team will not pull out
and represent well! And as for the tennis players, I don't see any of them not going to Athens or being disrespected should they play Daniilidou or any other Greek player.