Seems perfectly reasonable to me.
Yes, I agree as a point to debate in a broader sense.
Should only murderers be excluded or violent criminals or tax dodgers or people with a speeding conviction? What if it’s spent? In our society we consider people free once they’ve served a sentence and innocent if they’re arrested but not convicted. Should that change too then? What’s the difference between a Latvian in that situation and a Brit? Is one more likely to offend than the other?
IMO the OP is driven by xenophobic views. These people don’t like having Latvians and others over here so this is further evidence of how right they are in holding that view irrespective of the fact that Latvian murderers living over here and committing crime is going to be a very small risk in comparison to our homegrown murderers unless you think they’re particularly more likely to commit crimes.
My point irrespective is that using a girl’s likely murder as an opportunity to make a point about something is pretty low. Especially when the facts aren’t even clear yet. IMO again.