Do you really believe what you write? Neither Americans care about democracy in Iraq or Polish army had good intentions when invaded Russia. They got what deserved.
We can make this debate in other place. Lets stick to religion.
These sects were kicked out from other countries mostly because they were in opposition to rule of local monarch. Thus this is rather destabilizing factor.
The major impact of the Thirty Years' War, fought mostly by mercenary armies, was the extensive destruction of entire regions, denuded by the foraging armies. Episodes of famine and disease significantly decreased the populace of the German states and the Low Countries and Italy, while bankrupting most of the combatant powers. Some of the quarrels that provoked the war went unresolved for much a longer time. The Thirty Years' War was ended with the Treaty of Münster, a part of the wider Peace of Westphalia.
We avoided this wars. What is more ... most of this "heretics" were right. In modern churches you can't buy place in haven or saints leg isn't artefact. :)
Most people don't think if protestants or catholics are right. We gained big part of european elites (people who were thinking about aim, God, religion - small miniority in every nation). We avoided war Germans had in their country... Our native Polish Calvins have done a lot of good job