Mosques in the USA are regularly shot up and burned, people also break into the homes of Muslims and murder them. This happens a lot in the USA. Security is a concern and is often allocated for in the budget. Cameras, locks, sometimes even an armed guard, private security.
Here is a private security guard that took the Shahada and accepted Islam after 7 years on the job protecting the Masjid. That is a long time to think about becoming a Muslim. He broke down crying and was embraced with love.
I am an American Muslim and am building a Masjid, have to consider security as well. Would like to be involved with local church leaders and have positive inter-faith relations and do good deeds for each other and the community.