Two perspectives on Israel

Sorry, but no. I don't see how HAMAS benefits from a blockade/border control that prevents them from freely importing the goods and weapons they require to keep killing innocent people.

In that case I suggest you look and think.
The tunnels are a good place to look at for starters

He will tell you that blockade makes hamas and alike more popular and so on.

Sorry disapoint you on your simplistic view but no, I was going to suggest he starts with something basic in the blockade like cement which HAMAS has plenty of but the Red Cross and UN have trouble importing.
Then perhaps move onto the wider range of goods they smuggle, then consider how much money they are raking in from it and what terrorist organisations like to spend their money on.