Have you read this?
http://www.indonesiamatters.com/754/israeli-aircraft/
After the plan to buy unnecessary russian submarines the govt already plan to purchasing drones?
Indonesia is one of the more moderate countries in the OIC, but it doesn't mean that Indonesia will be invisible for the protest. Beside that, I don't think UAV will be useful. Shouldn't they buy BE-200 amphibious fire-fighting aircraft instead?
Not having heard an explanation for the planned purchase of Russian SSKs, I have to agree that they seem unnecessary/unwise.
As for the idea of Indonesia getting UAV... I think Indonesia would find them useful as long as they can be maintained. From the link, it appears that currently only smaller UAVs that could provide tactical data are going to be purchased. If Indonesian doesn't currently operate UAVs and is looking to build a capacity to do so, starting with smaller ones makes sense. As for protesting the purchase since it is coming from Israel, that is a political/social question, not a defence question. I don't anticipate Israel and Indonesia going to war against each other any time soon.
With regards to purchasing Be-200 Altair vs. UAVs... It boils down to three things, how are they to be used, how many are needed, and how much money is available to get them. Whatever type UAV is being purchased is priced at $6mil each, I can't imagine the Russians selling the Be-200 at that price. Indonesia might not have enough cash available in it's budget to get several Be-200s. Then there is the operating cost of a small UAV compared and contrasted with a MPA. Then, as I mentioned above, if the intention is to develop an IOC with UAVs, a Be-200 wouldn't do at all.
I think most people would agree that Indonesia faces challenges in patrolling it's 13,000 islands and the waters surrounding them. More patrol assets, both on the surface and in the air can help Indonesia meet the challenge. Given time, if Indonesia can develop the capacity to operate highly persistant maritime patrol UAVs, that could serve Indonesia better than purchasing more MPA.
Again, it all comes down to what the reasoning is behind the purchase.
-Cheers