Op your not being irrational at all.
I have a toddler in tow and life with such a creature is a different story than with older dc or even babies you can carry and run with.
I have anxiety going anywhere with mine because she will not play ball over anything.
I have to say I hate the - you ll let them win - posts as well.
I dont care about letting them win I want to live.
And I hate all the " I lived through the IRA blasts" well guess what, some poor people did not they are not here are they to tell us
.
Anyway op, what helped me, was a recent comment by someone on here re flying.
Go to heathrow or large airport and watch all those planes landing and all the planes taking off ( to land safely somewhere else).
think of the people who have to go about their daily lives.....go to work the office, they have no choice and they are OK.
Be vigilant but remember you are among thousands of germans on holiday and europeans and people from all over the world, all thinking like you. I would be vigilant but go and enjoy.
Sounds silly but I am holidaying in europe soon and I wont be sitting in the main square...or going to main obvious tourist areas...I am also nervous but am thinking as above and hoping....( I felt totally different when went away sans, DC earlier this year btw as can move more easily)