Of course we can take this question, "who started it?", all the way back to the beginning. But let's briefly take a look at an interesting fact regarding the recent history in light of the 2008-2009 Gaza Massacre:
From The Guardian (guardian.co.uk), 5 November 2008:
"A four-month ceasefire between Israel and Palestinian militants in Gaza was in jeopardy today after Israeli troops killed six Hamas gunmen in a raid into the territory.
"The Israeli military said the target of the raid was a tunnel that they said Hamas was planning to use to capture Israeli soldiers positioned on the border fence 250m away.
"'This was a pinpoint operation intended to prevent an immediate threat,' the Israeli military said in a statement. 'There is no intention to disrupt the ceasefire, rather the purpose of the operation was to remove an immediate and dangerous threat posted by the Hamas terror organisation.'
"Ehud Barak, the Israeli defence minister, had personally approved the Gaza raid, the Associated Press said. The Israeli military concluded that Hamas was likely to want to continue the ceasefire despite the raid, it said. The ceasefire was due to run for six months and it is still unclear whether it will stretch beyond that limit."
It is OK to blame Hamas for any crimes they commit.
It should also be OK to blame Israel for any crimes they commit.
What is not OK is to create a misleading timeline which begins with a barrage of rockets from the Gaza Strip, and try to pretend such an action was entirely unprovoked.
A very sad example of this is the comparison being made by very smug commenters on American TV newsmedia, including US politicians. They seem to think they can compare the rockets fired from Gaza to a hypothetical scenario whereby Canada was shooting rockets at the USA.
The USA does not keep Canada in an isolated state, cutting off food and money, causing living condition to be miserable on purpose as a collective punishment (for existing?).
People do not shoot missiles for no reason. Why do some people think this is the case? If violence is happening, it must be the violent person who is at fault? Do they not know how their own country was founded on violence? Violence towards British redcoats? Violence toward indigenous natives?
If anyone desired peace they would strive to create the conditions for peace.
By deeming the entire Palestinian race as "terrorist", the supporters of the Israeli government allow themselves to justify genocide, often in the name of God.