Your response sounds a bit like "I don't really care about the details", no?
I'll tell you where I think we depart in world view. I think what you're labeling "imperialism" is actually a wide range of real-politic actions, which are standard game in the international arena. Imperalism is a wishy-washy word, used almost as often as 'terrorism'.
Most of your examples are of large countries meddling in the affairs of lesser countries. Well, it happens all the time. Meddling in the affairs of other states is what all states do. If you're gonna call states out on this, do it fairly - don't omit non western states.
Look at another example - Russia is still heavily meddling in the affairs of its satellite states, from Ukraine, to Belarus, to the Georgia, Uzbekistan and what not. Iran is meddling in the affairs of Lebanon, Iraq, Saudi Arabia, Eritrea, and in the 90s even in balkan states. Argentina is meddling in the affairs of its neighbors, supporting various terrorist factions. Syria completely controls the Lebanese parliament, and arms several militias in Lebanon. Why did you never mention that under imperialism? You omit any sample that does not present western states as the bad guys. That's a very partial and limited world view.
Also to factually correct you, Israel never supported Hamas. Israel supported local muslim charities during the 70s. One of the charities was headed by a man who later set up Hamas. There's a difference of 10 years between both events.
During the 1970s Israel invested alot of money into the territories. It built universities, infrastructure, roads, hospitals, as part of the belief that solving poverty and grievances reduces violence. As part of that effort Israel also supported alot of charities, most of them indeed Islamic.
But in the 70s Islamic charities were actually peaceful and "reasonable" movements. The change in their nature came after the Iranian revolution and the establishment of Palestinian Islamic Jihad, supported by Iran. This, (and Afghanistan) lead the Islamic movements to explore violent options which they sadly later embraced.
There's a weird misconception on where US aid funds go. The US government is a lot of things, but they are not suckers. The quick answer is this: Almost all US aid has to be used on US products. In other words, almost all the money Israel gets, is eventually sponsoring US companies. Its the same as if the US govt. paid money directly to US companies to keep them profitable. As a side effect, it makes Israel politically dependent of your govt. So a win for your local businesses and a win for your diplomacy. Your government does not run charities for anyone.
Refusing to serve in the territories would have little effect on the occupation.
On the contrary, I think the more peaceniks serve in the territories the better. Do you really think its better to only leave there IDF troops who are pro-occupation fanatics? The more level-headed people serve there, the better. Because it means less conflict, less flare ups, and eventually a much faster way back to negociations.
The occupation can end in one of two ways:
1) a bilateral agreement between Israel and the PA. This is problematic since both sides are already stuck at the end of their rope, and the demands are simply too far away.
2) a unilateral step by Israel where it pulls out of most territories and builds a huge wall around itself, to assure no more terrorist attacks. This step would be very problematic considering the precedent set in Gaza, which shortly turned into a threat with an ever growing missile power.