I'm not saying you don't have a reason to be angry about the problem, I'm just saying that really it's the wrong response to target the people who use this system in the way they do. If you think it's badly designed for allowing such a use, fair enough -- and yes, maybe a "no" vote in June will change that. Not really sure it's fair to describe the people as "freeloaders" though.
Where does one draw the line on that, anyway? Young people, just out of school or university, may not have themselves paid anything into the system either, but will still find it important to have the welfare system prop them up for a few months while they finally search for a job. I believe the system does take their non-contribution into account at some level, but still the non-contributory principle might describe these as "freeloaders" too in the same way, and I'm not sure that's fair either.
In short, complain about the system and not the people.