I know you don't want to post again, but I just want to say that I feel like after you start killing people, people would stop trying to cross. I can't seeing it taking more than a few hundred deaths before people stopped trying. TBH after you see people being shot, if you don't stop trying yourself then it's not really anybody's fault other than your own. Combine that with the fact that the death count from terrorism will keep going up if we do nothing. Ynvaser's argument really isn't so far fetched when you weigh up a single large shooting of people who were warned that they would probably die if they continued breaking the law, against prolonged years of terrorist attacks against completely unsuspecting people who had no way of knowing they were in danger or any reason to be killed.
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However, like I have mentioned, I know very little about the situations these people were facing back home, so I can't say who I think is right. All I can say is that neither of you are arguing anything as extreme or as far fetched as the other seems to believe.