... Why do you have this need to harm animals for behaving like animals? Did your mother not love you or something?
Seriously, you think it's normal wanting to kill animals just because something a few of them did annoyed you?
They didn't attack you
They didn't shit all over you
And even if they did... It's animals doing their thing, just let them. Whatever you think these birds did to you I guarantee you that humanity has treated them a hundred times worse. If anything, birds do have a reason to kill us