I'm not a fan of increased generic mass surveillance but to be honest I could accept increased levels of physical searches on or near transportation hubs if it meant less chance of being killed.
I suggest you think very carefully indeed before making statements like that.
Do you really want to see physical searches before you are allowed on a train? Can you imagine the chaos at rush hour if that were implemented? Or the same at the entrance to bus stations and airports?
And whilst you're at it, what about physical searches before you're allowed into a shopping centre, or cinema complex?
Unless you make every country a complete police state, where public gatherings are not allowed, and access to every method of transport is strictly controlled, you will never stop this sort of incident from happening.
And if you do put such draconian measures in place, then the terrorists have won, all the way.