The population of Western Europe is just under 400 million. Rather higher than the USA's 300 million. And a whole lot fewer murders. Though the significant thing is murder rate, not overall numbers

And there the position is that Western and Central Europe has a murder rate of 1.5 per 100,000 while the United States has 6.1 per hundred thousand.

Of course there are a lot pof countries with higher murder rates than the USA, some a lot higher. But in all cases they are countries where people are far poorer, and which aren't really comparable to teh USA in the way Westen Europe is.

Of course poverty and so forth aren't by any means the only factors involved - and of course there are a whole lot of far poorer countries which have a much lower rate than the USA.

I doubt if the actual numnber of executions is too significant in such respects. More relevant might be the impact that the existence of government authorised killings has on the mindset of some people. More especially perhaps drawn out death sentences over many decades.