All you need to know about Hamas - and, in many ways, mainstream Palestinian Arab thought - can be seen in this tweet from the Al Qassam Brigades, their terrorist wing:
incident yesterday where an IDF soldier whose fingers were broken during a "peaceful protest" hit a protester with his rifle. Obviously, to the Qassam Brigades, use of force by an army against protesters is a terrible thing.
Then, in the very next sentence, we are informed that "resistance" - which to the Qassam Brigades means suicide bombings at pizza shops, shooting rockets at civilians, and stealing bulldozers to run over people - is the "only way" for them.
The rules are simple. Anything Israel does, no matter how justified, is inherently immoral - and anything Hamas does, no matter how heinous, is justified.
If it was only Hamas that felt this way, it wouldn't be so bad. But there are tens of millions of Arabs, hundreds of millions of Muslims and tens of thousands of Westerners who believe the exact same thing. In this case, Hamas is not anomalous - it is mainstream.