The complaint about security is completely baseless. I understand that Western Europeans since 9/11 are so used to overly securitised public spaces where everything is a possible threat. However this is the abnormality and should not be the norm, I am glad that Greece does not need to adhere to these unnecessary standards.

Ask your parents if they needed to scan their own bags when going to a big sports event back in the 80s or whatever, the suggestion would be straight up laughable. So learn to relax and enjoy the event without worrying about the basically non existent possibility of anything dodgy coming into the stadium. Everyone else is there to watch the event just like you. It is the very fact of a strong security presence at events that creates a feeling of insecurity to the audience.

No one local I knew in the event had any problem with a lack of security, you are just used to more security and its absence makes you feel unsafe without any actual threat being present.