She had a very tough and uncompromising stance on most things, including Northern Ireland and the Troubles. Rather than seek compromise, she increased the military presence there, which many believe exacerbated and prolonged the situation.
It is, of course, much more complex than this, but her policies regarding Northern Ireland are a large factor in why she is not remembered fondly by many Irish.
It doesn’t look burned, there’s no blackening.
Yep it’s the stuff they throw at you without warning, or even trick you into viewing, that’ll scar you.