As a Muslim I don't mind radicals being shut out, but my concern is eventually it'll spread to wanting to shut all mosques down, this is a slippery slope.
This issue will continue to become more salient as the quantity of Muslims in Europe grows. Austria has literally gone from 0% Muslim in the 1960's to probably 7.5-8% today. That trend is only accelerating with the mass migration of 2014-2016. If current trends continue, and given demographics there is no reason they shouldn't unless Europe has a wholesale political/ethical/legal transformation, Austria will be over 20% Muslim by 2050 and could be approaching 50% by the end of the century.
Question is will those people become fully Austrian only with a different faith? Will they view Austria's history, culture, and heroes as theirs? If not the tension will only increase over the coming decades.