That is sad. You must let go of the bitterness, it will eat you up in the end.
Keep everything in perspective. Remember people are just people and have faults and all. Don't hate anyone. See teh good in others, "always look on teh bright side of life" and "don't let the buggers grind you down". That was how Thatcher was and that is why she is a great person, worthy of Kipling's great poem.
'IF you can keep your head when all about you
Are losing theirs and blaming it on you,
If you can trust yourself when all men doubt you,
But make allowance for their doubting too;
If you can wait and not be tired by waiting,
Or being lied about, don't deal in lies,
Or being hated, don't give way to hating,
And yet don't look too good, nor talk too wise:'